ROAD SAFETY AUDIT MDM. Columbia Road at Dorchester Avenue. Dorchester, MA 10/14/2016. Prepared For: MassDOT. On Behalf Of: Edens

Transcription

1 ROAD SAFETY AUDIT Columbia Road at Dorchester Avenue Dorchester, MA 10/14/2016 Prepared For: MassDOT On Behalf Of: Edens Prepared By: MDM Transportation Consultants, Inc. 28 Lord Road Suite 280 Marlborough, MA MDM TRANSPORTATION CONSULTANTS, INC. Planners & Engineers

2 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Table of Contents Contents Background... 2 Project Data... 5 Project Location and Description... 8 Audit Observations and Potential Safety Enhancements... 9 Summary of Road Safety Audit List of Appendices Appendix A Appendix B. Appendix C. Appendix D. Appendix E. RSA Meeting Agenda RSA Audit Team Contact List Detailed Crash Data Additional Information Road Safety Audit References List of Figures Figure 1: Locus Map... 4 List of Tables Table 1: Participating Audit Team Members... 5 Table 2: Estimated Time Frame and Costs Breakdown Table 3: Potential Safety Enhancement Summary - Columbia Road at Dorchester Avenue Table 4: Potential Safety Enhancement Summary - Columbia Road at Buttonwood Street Page 2

3 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Background The focus of this (Road Safety Audit) RSA was at the intersection of Columbia Road at Dorchester Avenue including the adjacent unsignalized intersection of Columbia Avenue and Buttonwood Street. These intersections have been identified by the State as High Crash Clusters ( ) and are eligible for Highway Safety Improvement Program (HSIP) funding. According to MassDOT s website an HSIP eligible cluster is one in which the total number of "equivalent property damage only" crashes in the cluster is within the top 5% of all clusters in that region. Where equivalent property damage only" is defined by MassDOT as, a method of combining the number of crashes with the severity of crashes based on a weighted scale where a fatal crash is worth 10, an injury crash is worth 5 and a property damage only crash is worth 1. The RSA is intended to identify potential short term and long term safety improvements that can be evaluated and included as part of future design efforts for reconstruction with an emphasis on reducing injury type collisions. The study locations are shown in Figure 1. A Road Safety Audit was completed for the intersection of Columbia Road at Dorchester Avenue in the Dorchester neighborhood of Boston on August 16, The agenda for the RSA meeting held at St. Margaret s Church Hall in Dorchester is provided in Appendix A of this report. Page 3

4 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Figure 1: Locus Map Page 4

5 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Project Data As shown below in Table 1, the audit team consisted of a multidisciplinary team with representatives from state, regional and local agencies providing expertise in the engineering, planning, maintenance and emergency response fields. Contact information for the RSA attendees is provided in Appendix B of this report. Table 1: Participating Audit Team Members Audit Team Member Agency/Affiliation Adam Prichard Kevin Fitzgerald Lisa Schletzbaum James Salvia Selam Engida Carlos Cannon Dorothea Hass Amy Archer Saleema Mohamed Zarchy Veaner Amitai Lipton Eric Hogan Rob Ballasty Peter Furth Becca Wolfson Keith Hague Patrick Hoey Robert Michaud Dan Lindquist Jack Lawrence MassDOT Safety MassDOT Safety MassDOT Safety Boston EMS Boston Public HC Boston Police Department Walk Boston Pare Corporation MassDOT MassDOT D6 MassDOT D6 MassDOT D6 MassDOT D6 Northeastern University Boston Cyclists Union EDENS Boston Transportation Department MDM Transportation Consultants, Inc. MDM Transportation Consultants, Inc. MDM Transportation Consultants, Inc. Page 5

6 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Crash Data Crash trends and safety characteristics for the HSIP study intersection is based on crash data obtained from MassDOT and the City for the four-year period covering 2012 through The RSA team was provided an information package that included a detailed crash summary and graphs for each location and collision diagrams, which were prepared based on research of Local and State crash reports. The detailed crash information is provided in Appendix C with overview as follows: o o Columbia Road at Dorchester Avenue. Seventy-three (73) crashes were reported in the influence area of the Dorchester Ave at Columbia Rd signalized intersection approximately 18 per year resulting in a crash rate of 1.63, which is above the District-wide average of The majority of crashes involved angle/ sideswipe collisions (74%) followed by rear-end type collisions (19%). Forty one percent (41%) of the crashes resulted in non-fatal injuries. Approximately eighty-two percent (82%) of collisions occurred under dry roadway conditions. In general, the crashes were evenly distributed through the day with no significant drop-off during the overnight hours (12am to 6am). One fatality was reported involving a parked vehicle attempting to make a U-turn on the eastbound Columbia Road approach in April There were also three (3) pedestrian or bike related incidents. Columbia Road at Buttonwood Avenue. As shown in the collision diagram, the crash reports indicate that approximately 50-percent of the crashes occurred at the adjacent unsignalized intersection of Columbia Road and Buttonwood Street. The majority of the thirty-five (35) collisions at Buttonwood Street were angle crashes and involved drivers taking left turns from Buttonwood Street in conflict with the heavy traffic and multiple lanes on the Columbia Road approach and departure lanes. There were also a significant number of crashes involving left turn traffic from Columbia Road onto Buttonwood Street, a movement that is currently restricted between 4pm and 6pm on weekdays. Public Transportation The Massachusetts Bay Transit Authority (MBTA) operates the following transit services in the immediate study area: o o o Route 8: Bus Route 8 runs from the Harbor Point/UMass Boston to Kenmore Station. The route passes adjacent to the study intersection along Columbia Road. Service generally runs M-F 5:15 am to 1:00 am and Saturdays and Sundays 6:30am to 1:00 am. Route 18: Bus Route 18 runs from the Ashmont Station to Andrew Station. The route passes adjacent to the study intersection along Dorchester Avenue. Service generally runs M-F 4:45 am to 7:00 pm and Saturdays and Sundays 4:45 am to 6:45 pm. Route 41: Bus Route 18 runs from Centre and Eliot Streets to the JFK/Umass St Station. The route passes adjacent to the study intersection along Columbia Road. Service generally runs M-F 5:00 am to 9:30 pm and Saturdays and Sundays 7:40 am to 7:30 pm. Page 6

7 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Traffic Data The RSA team was provided information regarding daily and peak hour traffic volume networks for the study intersections, pedestrian volumes, collision diagrams, graphs, and photo documentation of the various approaches to the study intersections. This information is provided in Appendix D with summary as follows: Daily Traffic Volumes o o Columbia Road: Daily traffic volume on Columbia Road is approximately 15,000 vehicles per day (vpd), according to MassDOT permanent count station just east of Buttonwood Street. Dorchester Avenue: Daily traffic volume on Dorchester Avenue is approximately 10,000 vehicles per day (vpd), according to MassDOT permanent count station just north of Buttonwood Street. Pedestrian Volumes The existing pedestrian crossings at the study location range from minimal to high at the Columbia Road at Dorchester Avenue intersection. The crossings across Dorchester Avenue were approximately 82 during the weekday morning peak hour, 114 during the weekday evening peak hour and 89 during the Saturday midday peak hour. The crossings across Columbia Road were approximately 59 during the weekday morning peak hour, 55 during the weekday evening peak hour and 50 during the Saturday midday peak hour. The exclusive pedestrian phase at the Columbia Avenue/ Dorchester Avenue traffic signal was observed to be operational during the field visit. Page 7

8 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Project Location and Description The focus of this RSA was Columbia Road including its intersections with Dorchester Avenue and Buttonwood Street. The intersections are listed as Highway Safety Improvement Program (HSIP) cluster locations indicating that the study locations have been identified by the State to be located within a top 5% safety cluster in the region. A description of intersections is described below. Columbia Road/ Dorchester Avenue Signalized Dorchester Ave meets Columbia Road to form a four-way signalized intersection under MassDOT jurisdiction. The regulatory speed limits along Columbia Road and Dorchester Avenue are 30 miles per hour (mph). The Columbia Road eastbound approach to the intersection consists of an exclusive left-turn lane, a through travel lane, and a through/right-turn lane. The westbound Columbia Road approach consists of an exclusive left-turn lane, two through lanes, and a channelized right-turn lane. The northbound approach to the intersection consists of a shared left/ through lane and an exclusive right-turn lane. The Dorchester Ave. southbound approach to the intersection consists of a single general-purpose travel lane that operates as a left/through travel lane and an exclusive right turn lane. Painted crosswalks are provided across the northbound, southbound, and eastbound approaches. There is no crosswalk across the Columbia Avenue westbound approach. A painted bike lane is provided on the southbound Dorchester Avenue approach. Columbia Road/Buttonwood Street Unsignalized Buttonwood Street meets Columbia Road to form an unsignalized stop-controlled intersection under MassDOT jurisdiction. The southbound approach to Columbia Road is under STOP sign control. The regulatory speed limit along Buttonwood Street is 30 mph. The Columbia Road eastbound approach to the intersection consists of two through travel lanes, and a shared through/right-turn lane. The westbound Columbia Road approach consists of a marked left/through lane, one through travel lane, and a through/right-turn lane. Buttonwood Street is a one-way roadway in the southbound direction, and consists of a single general-purpose travel lane. No painted crosswalks are provided at the intersection. MBTA Bus Routes 8 and 41 have bus stops provided along Columbia Road just west of the Buttonwood intersection. Page 8

9 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Audit Observations and Potential Safety Enhancements The RSA team participated in a slide show presentation that included information regarding the study locations, which included existing traffic volumes, existing geometric conditions, existing travel speeds, collision diagrams, crash statistics and photographs of the intersections including of each approach. The RSA meeting and presentation conducted on August 16, 2016 was an interactive process in which safety issues, observations and concerns where discussed for the various intersections. The team members then did an in-field visit to both study locations as a group to identify safety issues and areas for improvement for each location. Post visit the observations were discussed and the findings were finalized for each location. The team then discussed potential short and long-term improvements. The subsequent sections of this report summarize the issues and potential improvements by location. Based on field observations, the RSA team determined that the study locations have the following potential safety issues, which are described in detail in the following section: Columbia Road at Dorchester Avenue 1 - On-Street Parking; 2 - Pedestrian Accommodations; 3 - Bicycle Accommodations; 4 - Lane Alignment; 5 - Signage; 6 - Opticom; 7 - Lighting; 8 - Pavement Markings; 9 - Traffic Signal Visibility; 10 - Excessive Corner Radii. Columbia Road at Buttonwood Street 11 - Unsafe Median Break/ Two-Stage Turns; 12 - Excessive Median Length; 13 - Pavement Markings; 14 - Signal Warrant; 15 - Excessive Lane Width; 16 - Signage. The feasibility of implementing the improvements to address the various safety issues may require additional engineering and/or technical review to determine feasibility. Page 9

10 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Columbia Road at Dorchester Avenue Safety Issue #1: On-Street Parking Observations: The segment of Columbia Road between Massachusetts Avenue and Dorchester Avenue includes two twelve foot travel lanes and a two foot paved shoulder in each direction. On-street parking is also allowed which reduces the travel way by approximately 7 feet for a parking lane. Therefore, the resulting travel way is effectively limited to 1.5 travel lanes in each direction. Field observations indicate that while free flow conditions exist vehicles generally use the segment of roadway as two travel lanes in each direction, however, when queueing occurs they stack in a single lane in each direction. The team discussed the peak hour congestion to the west of the study area of Pond Street, which is the location of a Public School. Any lane drops or re-striping would want to consider the congestion and school operations. Team members also indicated that traffic generated by the School at St. Margaret s Church would often double park along Columbia Road during pick-up and drop-off periods. On-Street parking along Columbia Road between Massachusetts Avenue and Dorchester Avenue reduces the travel way to 1 usable lane per direction. A review of the crash data indicates that two crashes were reported that involved on-street parking along the Columbia Road approach and departure from its intersection with Dorchester Avenue. One of the crashes resulted in a fatal injury type collision. Potential Enhancements: 1. Re-stripe Columbia Road to reflect the current use of the roadway and to provide bicycle accommodations by providing one travel lane, one 5-foot bike lane and one 7-foot parking lane in each direction. 2. Consider a parking restriction along Columbia Road during the core hours on weekdays to regain two full travel lanes. 3. Relocate parking within the influence area of the signalized Columbia Road/ Dorchester Avenue intersection. 4. Discuss alternative pick-up/drop-off procedures with the School/Church administration. Page 10

11 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue #2: Pedestrian Accommodations Observations: Field observations indicated that the pedestrian crossing lengths, specifically, across the Columbia Road eastbound approach and Dorchester Avenue northbound approach are excessively long at 110 feet and 75 feet long respectively. RSA team members indicated that it would be desirable to provide pedestrian bulb-outs and minimize the curb radii as much as possible to increase pedestrian visibility and safety as well as reduce the crossing lengths. Team members also indicated that that there is a nonfunctioning pedestrian push button in the median for Columbia Road to the east of Dorchester Avenue and there is no pedestrian handicapped ramps or marked crosswalk across the Columbia Road westbound approach. This missing crosswalk is a clear desire line for pedestrians walking along the eastbound side of Dorchester Avenue. Field observations indicate that the handicapped ramps are non-existent on the northwestern and southwestern corners of the intersection. The island in northern crossing obstructs half of the crosswalk and does not provide handicapped ramps. The remaining ramps with the exception of the ramp on the northeastern corner are all missing the truncated domes. RSA team members indicated that it might be desirable to provide concurrent pedestrian phasing at the intersection with leading pedestrian intervals where applicable. A review of the crash data indicates one pedestrian crash, which included a single vehicle hitting a pedestrian within the westbound Columbia Road departure lanes within the crosswalk resulting in a non-fatal injury. The existing pedestrian crossing lengths for the eastbound Columbia Road and northbound Dorchester Avenue approaches are excessively long. There is no handicapped ramp provided in the southeastern corner of the intersection. Page 11

12 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Potential Enhancements: 1. Install pedestrian bulb-out and minimize curb radii to increase pedestrian visibility and safety as well as reduce crossing lengths. 2. Install ADA compliant handicapped ramps and a marked crosswalk across the eastern side of the Columbia Road/ Dorchester Avenue intersection. 3. Install detectable warning panels on all of the handicapped ramps. 4. Evaluate concurrent pedestrian phasing and leading pedestrian intervals and implement the pedestrian intervals if desirable. 5. Evaluate adding a pedestrian refuge area for the Columbia Road crossing on the western side of the intersection. 6. Install ADA compliant handicapped ramps on the northwest corner, southwest corner and island in the northern crossing. Page 12

13 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue #3: Bicycle Accommodations Observations: There is currently a 5-foot wide bike lane on Dorchester Avenue in the southbound direction and shared bike/travel lane markings (sharrows) on Dorchester Avenue in the northbound direction. Field observations indicate that the bike lane markings through the signalized intersection of Columbia Road/Dorchester Avenue are currently missing. There are currently no bike accommodations along Columbia Avenue within the study area. RSA team members indicated that it would be desirable to reduce lane widths, and remove excess departure lanes to accommodate bike lanes on every approach. Likewise, as outlined under safety issue #1, Columbia Road could be re-striped to reflect the current use of the roadway and to provide bicycle accommodations by providing one travel lane, one 5-foot bike lane and one 7-foot parking lane in each direction. A review of the crash data indicates one bicycle related crash at the intersection in which a bicycle in the southbound direction along Dorchester Street ran the red light. A bike lane is provided on Dorchester Avenue southbound at Columbia Road. Potential Enhancements: Re-stripe the three-lane Columbia Road departure to include two departure lanes and a dedicated bicycle lane. 1. Reduce travel lane width and re-stripe unused departure lanes to provide dedicated bicycle lanes on all approaches to the intersection. 2. Provide bicycle accommodations on Columbia Road as outlined under safety issue #1 and to the east of Dorchester Avenue through updated pavement markings and lane re-allocation. 3. Replace the missing bicycle lane markings through the intersection for the existing bicycle lane in the southbound travel direction along Dorchester Avenue. Page 13

14 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue #4: Lane Alignment Observations: Field observations indicated that due to the median island and offset of the exclusive left turn lanes on the Columbia Road approaches to Dorchester Avenue, the approach and departure lanes are staggered by one lane width. As a result the exclusive left turn lanes align with a through departure lane. Furthermore, the Columbia Road westbound approach that is adjacent to the curb-line turns into parking lane in front of St. Margaret s Church. Given the awkward alignment along Columbia Road, the through travel lanes against the curb-line are underutilized. A review of the crash data indicates that approximately two crashes may have occurred due to lane alignment issues on the Columbia Road approaches to Dorchester Avenue. The exclusive left-turn lanes along Columbia Road are staggered resulting in a one-lane stagger for the through travel lanes with respect to their departure lane. The Columbia Road eastbound approach has a staggered alignment. Potential Enhancements: 1. Install painted dotted white lane extension lines (DWLEx) through the intersection to clarify lane shifts and to provide driver guidance. 2. Re-align the exclusive left-turn lanes on Columbia Road. Likewise, re-align the through approach and departure lanes on the Columbia Road approaches. Page 14

15 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue #5: Signage Observations: Field observations indicate that there is no lane use signage approaching the intersection. The RSA team noted that one of the through travel lanes in the westbound travel direction along Columbia Road turns into an exclusive left turn without advanced signage available. A through lane becoming an exclusive turn lane results in a lane trap situation. The RSA team also noticed that two No Turn on Red signs (R10-11b) are posted for the channelized right turn lane from Columbia Road westbound to Dorchester Avenue northbound, however, the right turn is channelized and is actually under Yield control. Team members also indicated that one of the two No Turn on Red signs, the one mounted on the traffic signal post, is mounted well below the minimum recommended 7 feet when located on a sidewalk section. Team members also noticed that a third No Turn on Red sign is also posted below the left turn signal on the westbound approach turning left onto Dorchester Avenue. This sign should be replaced with a Left Turn on Green Arrow Only sign (R10-5). There are two No Turn on Red signs on the Columbia Road and the channelized right turn is under Yield control and not STOP control. Columbia Road westbound lane trap and lack of advanced warning/ lane use signage. Potential Enhancements: 1. Evaluate the remove the two non-applicable No Turn on Red signs. 2. Use blank-out sign activated during exclusive pedestrian phases. 3. Install advanced intersection lane use signage on the Columbia Road westbound approach to Dorchester Avenue. Page 15

16 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue #6: Opticom Observations: Field observations indicated a significant number of ambulance and other emergency vehicles using this intersection, specifically from I-93 westbound on Columbia Road towards the area hospitals. RSA team members noted that the intersection did not have any emergency pre-emption (Opticom) installed. The team noticed that the majority of the emergency vehicles arrive from the east on Columbia Road and that without emergency pre-emption there was often delay for emergency apparatus due to intersection congestion. The team also noted that drivers attempting to make way for emergency vehicles were often forced into the intersection and became trapped in the middle of the intersection. There is no Opticom available at the intersection and a significant number of emergency apparatus utilize the intersection to gain access to the area hospitals. Potential Enhancements: 1. Install pre-emption system at intersection to enhance emergency response time and to avoid vehicles being trapped in the center of the intersection. Page 16

17 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue #7: Lighting Observations: Field observations by the RSA team indicated that the intersection does include street lighting. All of the street lighting at the Columbia Road intersection with Dorchester Avenue are the old style lights and light post and the team members indicated that it would be desirable to update the fixtures to include new LED style fixtures consistent with recent work at other area intersections in the neighborhood. Approximately 32% of the reported crashes occurred at dusk or under dark roadway conditions. Lighting at the intersection of Columbia Road at Dorchester Avenue. Potential Enhancements: 1. Update the street lighting to provide enhanced lighting for the intersection and included LED style light fixtures to reduce energy demand. Page 17

18 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue #8: Pavement Markings Observations: Field observations by the RSA team indicated that there are no pavement arrow markings on the through travel lanes or the shared through/right turn lanes. The RSA team observed that the outer shared lanes on Columbia Road are typically underutilized, partly due to lane alignment, lack of lane recognition by drivers, and drivers knowing they will be forced to merge left shortly after traveling through the intersection and on-street parking encroachment. There are no pavement markings for the Columbia Road westbound through/right turn lane which results in vehicles not using the lane as a through travel lane. Potential Enhancements: 1. Install pavement markings including lane designation arrows to increase lane recognition and utilization of travel lanes at the intersection. Page 18

19 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue #9: Traffic Signal Visibility Observations: Field observations by the RSA team indicated that the traffic signal head on the Columbia Road westbound approach in the splitter island is dull. Potential Enhancements: The traffic signal indication on the Columbia Road westbound approach is dull. 1. Check the visibility of the traffic signal heads at the Columbia Road intersection with Dorchester Avenue and replace with new LED type lenses as required to enhance visibility. Page 19

20 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue #10: Excessive Corner Radii Observations: RSA team participants noted that excessive corner radii allow turning vehicles to travel at higher speeds through the intersection. Specifically, the team noted large radii on the northbound Dorchester Avenue turn onto Columbia Road eastbound and the southbound Dorchester Avenue approach to Columbia Road westbound. The larger corner radii also increased the crosswalk length and time needed for pedestrian crossings as outlined in safety issue #2. Field observations indicate a high volume of heavy vehicles that use the intersection; therefore, any tightening of the corner radii should be done in a way to still accommodate the larger vehicles. Potential Enhancements: The Dorchester Avenue right turn corner radii onto Columbia Road eastbound allow for a high-speed turn. 1. Reduce the corner radii at the Columbia Road/ Dorchester Avenue intersection as appropriate to reduce turn speeds. Page 20

21 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Columbia Road at Buttonwood Street Safety Issue #11: Unsafe Median Break/ Two-Stage Turns Observations: Field observations by the RSA team at the adjacent intersection of Columbia Road and Buttonwood Street indicated that a significant number of vehicles along Dorchester Avenue traveling southbound using Buttonwood to by-pass the traffic signal at Columbia Road/Dorchester Avenue. An unsignalized left-turn movement from Buttonwood Street across three westbound travel lanes on Columbia Road and then a merge into the eastbound travel lanes on Columbia Road typically results in a two-stage turn. The RSA team observed that the median is too narrow for a vehicle to stage itself and often leaves the inner westbound Columbia Road lane blocked. A review of the accident data indicates that approximately 35 crashes occurred at the intersection of Columbia Road/ Buttonwood Street including 12 crashes that included vehicles exiting Buttonwood Street onto Columbia Road. The RSA team noticed multiple near-miss occurrences in a short timespan while observing this intersection. The crash data indicates that at least seven of the crashes were courtesy crash types, where a courtesy crash is defined as a condition when a vehicle in one-lane stops to let a vehicle turn, but a vehicle in the adjoining lane does not see the turning vehicle, resulting in a crash with the turning vehicle. Likewise, a significant number of vehicles traveling westbound on Columbia Avenue turn left onto Buttonwood Street to by-pass the traffic signal at Columbia Road/Dorchester Avenue. A review of the accident data indicates that approximately 12 crashes included vehicles exiting Columbia Road onto Buttonwood Street. Simultaneous double left turn and through movements from Buttonwood Street onto or across Columbia Road. The two-stage turn also blocks the westbound Columbia Road approach lane. Left turn from Columbia Road onto Buttonwood Street is restricted (with signage) from 4-6pm. Potential Enhancements: 1. Widen the median to allow vehicles to properly make two-stage turns without blocking adjacent travel lanes. 2. Close the median break and restrict Buttonwood movements to only right turns. 3. Provide signage to restrict left turns from Buttonwood Street onto Columbia Road. Page 21

22 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue #12: Excessive Median Length Observations: The RSA team mentioned that an excessively long median break (80± feet) is provided along Columbia Road at its intersection with Buttonwood Street. The excessive median length promotes multiple simultaneous turning vehicles onto Buttonwood Street southbound and from Buttonwood Street onto Columbia Road. Field observations indicated that vehicles stack side by side in the narrow median area. An 80-foot long median break is provided at Buttonwood Street. Potential Enhancements: 1. Shorten the median break length as to not promote multiple vehicles wide staging. Page 22

23 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue #13: Pavement Markings Observations: Field observations by the RSA team indicated that there is a significant lack of pavement markings on the Buttonwood Street southbound approach to Columbia Road. Specifically, there is no STOP bar and no marked crosswalk for the Buttonwood Street approach to Columbia Road. Likewise, there is no marked crosswalk on the Buttonwood Street departure from Columbia Road. The RSA team discussed the potential desirability to install Do Not Block the Box markings on Columbia Road at its intersection with Buttonwood Street that would assist vehicles turning from Buttonwood Street through westbound queues that often extend back from the adjacent traffic signal at Columbia Road/Dorchester Avenue. However, it was also concern that Do Not Block the Box markings could potentially lead to an increase in courtesy crashes. No STOP bar or crosswalk markings on the Buttonwood Street approach to Columbia Road. Columbia Road westbound traffic queued through the Buttonwood Street intersection. Potential Enhancements: 1. Install a STOP bar on the Buttonwood Street approach to Columbia Road. 2. Install crosswalk markings for the crosswalks across Buttonwood Street. 3. Add Do Not Block the Box pavement markings and signage at the intersection to create gaps in queued vehicles along Columbia Road. Page 23

24 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue #14: Signal Warrant Observations: Field observations by the RSA team indicated that a large number of vehicles from both Buttonwood Street and Columbia Road make turning movements at this unsignalized intersection. Due to the high volume, high crash rate and influence from the nearby traffic signals at Columbia Road/ Dorchester Avenue and Columbia Road/ I-93 southbound ramps, a traffic signal warrant should be examined for this intersection. The proximity to the adjacent signals at the Columbia Road/Dorchester Avenue and Columbia Road/I-93 southbound ramps was noted by team members and the potential to coordinate the traffic signals may be desirable. The team noted that coordination of a future traffic signal at Columbia Road/Buttonwood Street traffic signal would not only allow safer turning movements onto Columbia Road while not significantly impeding the Columbia Road traffic stream. The RSA team also noted that a traffic signal at this location would also be an opportunity to provide a pedestrian crossing across Columbia Road connecting the southern side of Columbia Road with an existing desire line to an existing transit stop at the intersection. A traffic signal may be warranted given the turning movement demand from Buttonwood Street onto Columbia Road. Potential Enhancements: Mid-block pedestrian crossing at Columbia Road/Buttonwood Street. 1. Review the applicable traffic signal warrants and install a traffic signal and associated equipment if warranted. 2. Review and if applicable, coordinate the future traffic signal with the nearby intersections of Columbia Road/ Dorchester Avenue and Columbia Road/I/93 southbound ramps. Page 24

25 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue #15: Excessive Lane Widths Observations: Field observations by the RSA team indicated that when travelling eastbound on Columbia Road, the travel lanes appear to be unnecessarily wide. Wide lanes allow for much higher speeds and make crossing said lanes more difficult for vehicles and pedestrians alike. The outer lane appears to have historically been two lanes wide. Installing narrower lanes and reallocating the extra space would allow bike lanes. Relocating the curb-line and/or installing bulb-outs were mentioned as potential solutions in reference to providing shorter crossing distances. Potential Enhancements: Wide travel lanes on Columbia Road could be converted to provide bicycle accommodation. 1. Reduce lane widths and re-allocate the excess pavement area to provide bike lanes along Columbia Road and to reduce travel speeds. 2. Relocate the curb-line and/or installing bulb-outs to provide shorter crossing distances. Page 25

26 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue #16: Signage Observations: The RSA team noticed that a sign in the median on Columbia Road prohibits left turn movements onto Buttonwood Street during the weekday evening peak periods of 4PM-6PM. The RSA team noticed that there is no such restriction during the weekday morning peak periods (7AM-9AM) or for the Buttonwood Street left turns onto Columbia Road. Restricting turns from Buttonwood Street during the peak periods should reduce crashes at this intersection given the fact that 13 of the reported crashes at this intersection occurred between the weekday peak periods (7AM-9AM or 4PM-6PM). RSA team members also indicated that there is no keep right (graphic) sign in the raised median for vehicles travelling eastbound on Columbia Road. Missing keep right (graphic) sign in the median for Columbia Road eastbound at Buttonwood Street. Sign restriction is in place for left turns onto Buttonwood Street from Columbia Road westbound between 4PM and 6PM. Potential Enhancements: 1. Restrict left turn movements from Buttonwood Street onto Columbia Road during peak hours through signage. 2. Install a keep right (graphic) sign (R4-7) on the median to alert drivers of the raised median on Columbia Road eastbound. Page 26

27 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Summary of Road Safety Audit After discussing the various safety deficiencies within the study area, participants discussed potential solutions. The audit participants were encouraged to consider both short and long-term improvements for each of the existing safety issues. Each improvement considered has been categorized as short-term, midterm, or long-term based on the definitions shown in Table 2. Additionally, a cost category has been assigned to each improvement based on the parameters set forth in Table 2. Table 2: Estimated Time Frame and Costs Breakdown Time Frame Costs Short-Term <1 Year Low <$10,000 Mid-Term 1-3 Years Medium $10,001-$50,000 Long-Term >3 Years High >$50,000 The RSA is intended to identify potential safety improvements that can be evaluated and included as part of the design process for future reconstruction efforts. The short-term low-cost improvements should be considered by the responsible agency for immediate implementation, as appropriate. A summary of the potential recommendations discussed by the RSA audit team are summarized in Table 3 (Columbia Road at Dorchester Avenue) and Table 4 (Columbia Road at Buttonwood Street). The recommendations are summarized based on the potential safety payoff, time frame, approximate cost, and responsible agency. The safety payoff is a subjective judgment of the potential effectiveness of the safety recommendations listed below. Page 27

28 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue On-Street Parking Table 3: Potential Safety Enhancement Summary Columbia Road at Dorchester Avenue Potential Safety Enhancement Re-stripe Columbia Road to reflect current use: one travel lane, one 5- foot bike lane, and one 7-foot parking lane. Consider parking restriction along Columbia Road during the core hours on weekdays. Relocate parking within the influence area of the signalized intersection. Discuss alternative pick-up/dropoff procedures with School/Church administration. Safety Payoff Time Frame Cost Responsible Party High Mid-Term Medium MassDOT High Mid-Term Low High Mid-Term Low Medium Short-Term Low MassDOT/ City of Boston MassDOT/ City of Boston MassDOT/ City of Boston Page 28

29 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Table 3 (Continued): Potential Safety Enhancement Summary Columbia Road at Dorchester Avenue Safety Issue Potential Safety Enhancement Safety Payoff Time Frame Cost Responsible Party Install pedestrian bulb-outs and minimize curb radii. High Long-Term High MassDOT Install ADA compliant handicapped ramps and a marked crosswalk across the eastern side of the High Long-Term Medium MassDOT intersection. Install detectable warning panels on all of the handicapped ramps. High Short-Term Low MassDOT Pedestrian Evaluate/implement concurrent MassDOT/ Accommodations pedestrian phasing and leading Medium Long-Term Medium City of Boston pedestrian intervals Evaluate adding a pedestrian refuge area for the Columbia Road crossing on the western side of the Low Long-Tern Low MassDOT intersection. Install ADA compliant handicapped ramps on the northwest corner, southwest corner and island in the High Mid-Term Medium MassDOT northern crossing Page 29

30 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue Bicycle Accommodations Table 3 (Continued): Potential Safety Enhancement Summary Columbia Road at Dorchester Avenue Potential Safety Enhancement Reduce travel lane width and restripe un-used departure lanes to provide dedicated bicycle lanes. Provide bicycle accommodations on Columbia Road and to the east of Dorchester Avenue. Replace missing bicycle lane markings through the intersection for the existing bicycle lane in the southbound travel direction along Dorchester Avenue. Safety Payoff Time Frame Cost Responsible Party High Long-Term Medium MassDOT High Long-Term Medium MassDOT Low Short-Term Low MassDOT Lane Alignment Paint dotted white lane extension lines (DWLEx) through the intersection to clarify lane shifts. Re-align the exclusive left-turn, through lanes, and departure lanes on Columbia Road. High Short-Term Low MassDOT High Long-Term High MassDOT Signage Remove the two non-applicable No Turn on Red signs. Use Blank-out sign activated during exclusive pedestrian phases. Install advanced intersection lane use signage on the Columbia Road westbound approach to Dorchester Avenue. Low Short-Term Low MassDOT Low Long-Term Low MassDOT Medium Short-Term Low MassDOT Page 30

31 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue Opticom Table 3 (Continued): Potential Safety Enhancement Summary Columbia Road at Dorchester Avenue Potential Safety Enhancement Install pre-emption system at intersection to enhance emergency response time and to avoid vehicles being trapped in the center of the intersection. Safety Payoff Time Frame Cost Responsible Party High Long-Term Medium MassDOT/ City of Boston Lighting Update the street lighting to provide enhanced lighting for the intersection and included LED style light fixtures to reduce energy demand. Low Medium-Term Medium City of Boston Pavement Markings Install pavement markings including lane designation arrows to increase lane recognition and utilization of travel lanes at the intersection. Medium Short-Term Low MassDOT Traffic Signal Visibility Check the visibility of the traffic signal heads at the Columbia Road intersection with Dorchester Avenue and replace with new LED type lenses as required to enhance visibility. Medium Short-Term Medium MassDOT/ City of Boston Excessive Corner Radii Reduce the corner radii at the Columbia Road/ Dorchester Avenue intersection as appropriate to reduce turn speeds. High Long-Term High MassDOT Page 31

32 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue Unsafe Median Break/ Two-Stage Turns Table 4: Potential Safety Enhancement Summary Columbia Road at Buttonwood Street Potential Safety Enhancement Safety Payoff Time Frame Cost Responsible Party Widen median to allow vehicles to properly make two-stage turns. High Long-Term Medium MassDOT Close median break and restrict Buttonwood movements to right High Long-Term Medium MassDOT turns only. Provide signage to restrict left turns from Buttonwood Street onto Low Short-Term Low MassDOT Columbia Road Excessive Median Width Shorten median break length as not promote multiple vehicle staging. to High Long-Term Medium MassDOT Pavement Markings Install a STOP bar on the Buttonwood Street approach to Columbia Road. Install crosswalk markings across Buttonwood Street. Add Do Not Block the Box pavement markings and signage at the intersection. Low Short-Term Low Low Short-Term Low MassDOT/ City of Boston MassDOT/ City of Boston Low Short-Term Low MassDOT Signal Warrant Review applicable traffic signal warrants. Install if warranted. Review and if applicable, coordinate future signal with nearby intersections. High Long-Term High MassDOT High Long-Term Medium MassDOT Page 32

33 Road Safety Audit Columbia Road at Dorchester Avenue Prepared by MDM Transportation Consultants, Inc. FINAL Safety Issue Excessive Lane Widths Table 4 (Continued): Potential Safety Enhancement Summary Columbia Road at Buttonwood Street Potential Safety Enhancement Reduce lane widths and reallocate excess pavement to provide bicycle lanes along Columbia Road. Relocate curb-line and/or install bulb-outs to provide shorter crossing distances. Safety Payoff Time Frame Cost Responsible Party High Long-Term Medium MassDOT High Long-Term High MassDOT Signage Restrict left turn movements from Buttonwood Street onto Columbia Road during peak hours through signage. Install a keep right (graphic) sign (R4-7) on the median to alert drivers if the raised median on Columbia Road eastbound. High Short-Term Low MassDOT Medium Short-Term Low MassDOT Page 33

34 Appendix A. RSA Meeting Agenda

35 Road Safety Audit Dorchester MEETING LOCATION: St. Margaret s Church Hall Roseclair Street Entrance, Dorchester DATE: Tuesday August 16, 2016 TIME: 1:00 PM 3:00 PM Type of meeting: Road Safety Audit Columbia Road at Dorchester Avenue Attendees: Invited Participants to Comprise a Multidisciplinary Team 1:00 PM Welcome and Introductions 1:15 PM Review of Site-Specific Material Crash Summary Data & Collision Diagrams See Attached Existing Geometries and Conditions Aerial Orthophoto and photos 2:00 PM Visit the Site Location In-field review of intersection including Buttonwood Street As a group, identify safety issues and areas for improvement at each location 2:30 PM Post Visit Discussion / Completion of RSA Discuss observations and finalize findings Discuss potential improvements and finalize recommendations 3:00 PM Adjourn for the Day but the RSA has not ended Instructions for Participants: Before attending the RSA on August , participants are encouraged to drive through the intersections and complete/consider elements on the RSA Prompt List with a focus on safety. All participants will be actively involved in the process throughout. Participants are encouraged to come with thoughts and ideas, but are reminded that the synergy that develops and respect for others opinions are key elements to the success of the overall RSA process. After the RSA meeting, participants will be asked to comment and respond to the document materials to assure it is reflective of the RSA completed by the multidisciplinary team.

36 Appendix B. RSA Audit Team Contact List

37 Participating Audit Team Members Date: August 16, 2016 Location: 800 Columbia Road Dorchester, MA Audit Team Members Agency/Affiliation Address Phone Number Adam Prichard MassDOT Safety (316) Kevin Fitzgerald MassDOT Safety (857) Lisa Schletzbaum MassDOT Safety (857) James Salvia Boston EMS (617) Selam Engida Boston Public HC (617) Carlos Cannon Boston Police Department (617) Dorothea Hass Walk Boston (617) Amy Archer Pare Corperation (401) Saleema Mohamed MassDOT (857) Zachary Veaner MassDOT D6 (857) Amitai Lipton MassDOT D6 (857) Eric Hogan MassDOT D6 (857) Rob Ballasty MassDOT D6 (857) Peter Furth Northeastern University (617) Becca Wolfson Boston Cyclists Union (315) Keith Hague EDENS (617) Patrick Hoey Boston Transportation Department (617) Robert Michaud MDM Transportation Consultants, Inc. (508) Dan Lindquist MDM Transportation Consultants, Inc. (508) Jack Lawrence MDM Transportation Consultants, Inc. (508)

38 Appendix C. Detailed Crash Data

39

40 TABLE A3 CRASH SUMMARY COLUMBIA ROAD AT DORCHESTER AVENUE & BUTTONWOOD STREET JANUARY 2012 THROUGH DECEMBER 2015 Crash Collision Roadway Roadway (#) Date Day of Week Time of Day (Type) Lighting Weather Condition Condition Severity Ages Comments Columbia Avenue at Dorchester Avenue 1 January 5, 2012 Thursday 7:14 Angle Daylight Clear Dry Non-Fatal Injury Crossing Columbia Road first 2 lanes let car go, did not see car in 3 rd lane 2 January 17, 2012 Tuesday 00:00 Single Vehicle Dark Snow Snow Property Damage Only 35 Lost control due to snow 3 January 27, 2012 Friday 10:38 Angle Daylight Rain Wet Non-Fatal Injury Attempted U-Turn. Cited for failing to grant right of way 4 February 1, 2012 Wednesday 5:00 Angle Dark Cloudy Dry Non-Fatal Injury Signals operating in flash mode 5 February 27, 2012 Monday 15:36 Angle Daylight Clear Dry Property Damage Only Cut off trying to cross Columbia Road. Cited for failure to yield right of way 6 March 11, 2012 Sunday 13:38 Angle Dark Clear Dry Non-Fatal Injury Signals operating in flash mode 7 April 8, 2012 Sunday 11:28 Sideswipe Daylight Clear Dry Property Damage Only Merging into right lane. 8 April 12, 2012 Thursday 14:55 Angle Daylight Clear Dry Fatal Injury Attempting U-Turn from parking space. Transported to Boston Medical Center 9 May 15, 2012 Tuesday 7:21 Rear End Daylight Clear Dry - Driver stated gas pedal stuck to floor. Cited for failure to stop. 10 May 30, 2012 Wednesday 8:19 Angle Daylight Clear Dry Non-Fatal Injury Cut off trying to cross Columbia Road. Cited for failure to yield right of way 11 June 21, 2012 Thursday 20:58 Angle Dark Clear Dry Property Damage Only Backing up in Hess parking lot 12 July 6, 2012 Friday 5:55 Angle Daylight Clear Dry Non-Fatal Injury Signals operating in flash mode. Cited for failure to yield right of way 13 August 8, 2012 Wednesday 13:19 Angle Daylight Clear Dry Non-Fatal Injury Crossing Columbia Road first 2 lanes let car go, did not see car in 3 rd lane 14 August 16, 2012 Thursday 19:20 Rear end Daylight Clear Dry Property Damage Only Citation for failure to use care in stopping 15 September 4, 2012 Tuesday 16:58 Angle Daylight Cloudy Wet Non-Fatal Injury Crossing Columbia Road first lane let car go, did not see car in 2nd lane 16 September 8, 2012 Saturday 13:20 Angle Daylight Clear Dry Non-Fatal Injury Crossing Columbia Road first 2 lanes let car go, did not see car in 3 rd lane 17 September 18, 2012 Tuesday 22:16 Sideswipe Dark Windy Dry Property Damage Only Merging into left lane. 18 October 7, 2012 Sunday 15:30 Angle Daylight Rain Wet Property Damage Only 29 - Exiting Hess attempting to merge to left lane on Columbia. Cited for failing to yield to on coming traffic 19 October 13, 2012 Saturday 17:30 Angle Daylight Clear Dry Property Damage Only Hit and Run 20 October 18, 2012 Thursday 5:08 Angle Dark Clear Dry Non-Fatal Injury Signals operating in flash mode 21 November 1, 2012 Thursday 10:48 Rear End Daylight Clear Dry Property Damage Only Trailer was struck 22 December 5, 2012 Wednesday 7:53 Angle Daylight Clear Dry Property Damage Only Exiting Hess onto Columbia Road first 2 lanes let car go, did not see car in 3 rd lane 23 December 5, 2012 Wednesday 8:40 Angle Dark Clear Dry Property Damage Only Exiting St. Margaret s driveway 24 December 26, 2012 Wednesday 14:30 Sideswipe Daylight Clear Dry Non-Fatal Injury Merging into left turn lane 25 December 26, 2012 Wednesday 18:40 Rear End Dark Rain Wet Non-Fatal Injury Stopped short to take left onto Buttonwood Street 26 December 31, 2012 Monday 9:40 Rear end Daylight Clear Dry Property Damage Only Distracted Looking at GPS 27 January 24, 2013 Thursday 14:10 Angle Daylight Clear Dry Property Damage Only Cut-off trying to merge into left turn lane 28 February 2, 2013 Saturday 4:20 Angle Dark Clear Dry Non-Fatal Injury Signals operating in flash mode 29 February 17, 2012 Sunday 2:10 Rear End Dark Clear Dry Property Damage Only 46 24

41 TABLE A3 CRASH SUMMARY COLUMBIA ROAD AT DORCHESTER AVENUE & BUTTONWOOD STREET JANUARY 2012 THROUGH DECEMBER 2015 Crash Collision Roadway Roadway (#) Date Day of Week Time of Day (Type) Lighting Weather Condition Condition Severity Ages Comments Columbia Avenue at Dorchester Avenue 30 February 17, 2013 Sunday 16:20 Rear End Daylight Rain Wet Property Damage Only Hit and run 31 March 10, 2013 Sunday 1:20 Rear end Daylight Clear Dry Non-Fatal Injury Bus Rear Ended by taxi 32 March 10, 2013 Sunday 18:00 Single Vehicle Daylight Clear Dry Non-Fatal Injury Pedestrian hit while crossing 33 March 13, 2013 Wednesday 3:42 Rear End Daylight Clear Dry Non-Fatal Injury Warning issued for failure to stop 34 April 23, 2013 Tuesday 13:28 Sideswipe Dusk Clear Dry Property Damage Only Hit and run 35 April 25, 2013 Thursday 7:55 Angle Daylight Clear Dry Property Damage Only April 27, 2013 Saturday 9:00 Rear End Daylight Clear Dry Non-Fatal Injury Following too close 37 May 20, 2013 Monday 14:45 Sideswipe Daylight Cloudy Dry Property Damage Only Expired license 38 June 14, 2013 Friday 15:45 Rear End Daylight Cloudy Dry Property Damage Only Revoked license 39 November 11, 2013 Monday 8:10 Angle Daylight Clear Dry Property Damage Only Attempted to make left turn from right lane 40 November 26, 2013 Tuesday 17:33 Angle Dark Clear Dry Property Damage Only December 27, 2013 Friday 20:39 Rear End Dark Cloudy Dry Property Damage Only Hit and run 42 March 11, 2014 Tuesday 22:23 Angle Dark Cloudy Dry Non-Fatal Injury Cut-off trying to merge into left turn lane 43 March 16, 2014 Sunday 1:58 Angle Daylight Clear Dry Non-Fatal Injury March 16, 2014 Sunday 23:23 Sideswipe Dark Cloudy Dry Property Damage Only Exiting parking space on street. Cited for OUI 45 April 3, 2014 Thursday 8:44 Rear End Daylight Clear Dry Property Damage Only Following too close 46 April 4, 2014 Friday 12:00 Angle Daylight Clear Dry Property Damage Only April 10, 2014 Thursday 16:45 Rear End Daylight Clear Dry Non-Fatal Injury Unlicensed driver 48 May 2, 2014 Friday 13:44 Angle Daylight Clear Dry Property Damage Only Ran red light 49 May 8, 2014 Thursday 8:10 Angle Daylight Clear Dry Non-Fatal Injury Taking left turn cut off oncoming traffic 50 May 11, 2014 Sunday 14:55 Angle Daylight Clear Dry Non-Fatal Injury Taking left turn cut off oncoming motorcycle 51 May 14, 2014 Wednesday 17:08 Angle Daylight Clear Dry Property Damage Only Turning left from Buttonwood cut off oncoming traffic 52 June 13, 2014 Friday 3:15 Sideswipe Dark Rain Wet Property Damage Only Merging into left turn lane 53 June 20, 2014 Friday 9:00 Angle Daylight Clear Dry Property Damage Only Bicycle ran red light 54 October 8, 2014 Wednesday 17:45 Angle Daylight Clear Dry Non-Fatal Injury Turning left from Buttonwood cut off oncoming traffic 55 October 14, 2014 Tuesday 13:12 Angle Daylight Clear Dry Property Damage Only Making left first 2 lanes let car go, did not see car in 3 rd lane 56 December 8, 2014 Monday 16:00 Sideswipe Dusk Rain Wet Property Damage Only Merging into right turn lane 57 December 11, 2014 Thursday 16:51 Rear End Dark Clear Dry Property Damage Only Cited for following too close 58 January 16, 2015 Friday 14:20 Angle Daylight Clear Dry Property Damage Only Edged out of Buttonwood in heavy traffic 59 March 4, 2015 Wednesday 9:19 Angle Daylight Snow Wet Property Damage Only Making left first 2 lanes let car go, did not see car in 3 rd lane 60 March 26, 2015 Thursday 7:21 Angle Daylight Cloudy Dry Property Damage Only Merging into left turn lane. Unlicensed driver 61 April 18, 2015 Saturday 15:35 Sideswipe Daylight Clear Dry Non-Fatal Injury May 24, 2015 Sunday 12:25 Single Vehicle Daylight Clear Dry Non-Fatal Injury Hit pedestrian walking bike in crosswalk 63 June 26, 2105 Friday 11:03 Sideswipe Dark Clear Dry Non-Fatal Injury Motorcycle ran red light 64 July 12, 2015 Sunday 4:03 Single Vehilce Dark - - Property Damage Only Hit pole after brakes failed 65 July 14, 2015 Tuesday 11:19 Angle Daylight Clear Dry Property Damage Only Cars turning left and right onto Columbia merged into same lane 66 September 13, 2015 Tuesday 4:15 Head On Dark Clear Dry Property Damage Only Driving in wrong direction. Arrested for OUI 67 September 26, 2015 Saturday 3:13 Angle Daylight Clear Dry Non-Fatal Injury Attempting to make a U-turn

42 TABLE A3 CRASH SUMMARY COLUMBIA ROAD AT DORCHESTER AVENUE & BUTTONWOOD STREET JANUARY 2012 THROUGH DECEMBER 2015 Crash Collision Roadway Roadway (#) Date Day of Week Time of Day (Type) Lighting Weather Condition Condition Severity Ages Comments Columbia Avenue at Dorchester Avenue 68 October 10, 2015 Saturday 00:00 Angle Dark Clear Dry Non-Fatal Injury Cited for failure to yield and suspended license 69 October 11, 2015 Sunday 1:35 Sideswipe Dark Clear Dry Property Damage Only Merging into left turn lane. Unlicensed driver 70 October 14, 2015 Wednesday 5:50 Angle Dusk Clear Dry Property Damage Only Both drivers reported having green light 71 December 2, 2015 Wednesday 12:29 Angle Daylight Rain Wet Property Damage Only Ran red light 72 December 6, 2015 Sunday 7: Non-Fatal Injury Failure to stop 73 December 31, 2015 Thursday 1:25 Angle Daylight Cloudy Dry Non-Fatal Injury Making left first 2 lanes let car go, did not see car in 3 rd lane

43 Columbia Road at Dorchester Avenue and Buttonwood Street Percentage 16% 14% 12% 10% 8% 6% 4% 2% 0% Crashes by Month 15% 12% 12% 11% 11% 7% 7% 7% 7% 4% 4% 3% January February March April May June July August September October November December Month Crashes by Day of the Week 25% 20% 18% 21% 19% Percentage 15% 10% 7% 14% 12% 10% 5% 0% Monday Tuesday Wednesday Thursday Friday Saturday Sunday Day Percentage 16% 14% 12% 10% 8% 6% 4% 2% 0% Crashes by Time of Day 15% 12% 12% 12% 10% 8% 8% 7% 5% 4% 3% 3% 12-2 AM 2-4 AM 4-6 AM 6-8 AM 8-10 AM PM 12-2 PM 2-4 PM 4-6 PM 6-8 PM 8-10 PM AM Time Crashes by Crash Type Percentage 70% 60% 50% 40% 30% 20% 10% 0% 59% 19% 15% 1% 5% 0% Angle Rear-End Head-On Sideswipe Single Vehicle Unknown/Other Crash Type

44 Columbia Road at Dorchester Avenue and Buttonwood Street 70% 60% 66% Crashes by Roadway Lighting Percentage 50% 40% 30% 20% 10% 0% 27% 5% 0% 1% Daylight Dark - Lit Roadway Dusk Dawn Unknown Roadway Lighting Percentage 80% 70% 60% 50% 40% 30% 20% 10% 0% Crashes by Weather Condition 74% 11% 10% 3% 0% 3% Clear Cloudy Rain Snow Sleet/Hail Unknown Weather Condition Crashes by Roadway Condition Percentage 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 82% 12% 3% 3% Dry Wet Snow Unknown/Other Roadway Condition Percentage 60% 50% 40% 30% 20% 56% Crashes by Crash Severity 41% 10% 0% Property Damage Only Non-Fatal Injury Fatal Crash Severity 1%

45 Appendix D. Additional Information

46 Road Safety Audit Boston, MA Dorchester Neighborhood Columbia Road at Dorchester Avenue (Including Buttonwood Street) Tuesday, August 16, 2016 St. Margaret s Church Hall Roseclair Street Entrance

47 Meeting Outline 1:00 PM Welcome and Introductions 1:15 PM Review of Site Specific Material Crash Summary Data & Collision Diagrams Existing Geometries and Conditions Aerial and Photographs 2:00 PM Visit the Site Location In Field review of intersection including Buttonwood Street As a group, identify safety issues and areas for improvement at each location 2:30 PM Post Visit Discussion/ Completion of RSA Discuss Observations and Finalize Findings Discuss Potential Improvements and finalize recommendations 3:00 PM Abjourn for the Day but the RSA has not ended

48 Welcome and Introductions Robert J. Michaud, PE, Managing Principal Daniel C. Lindquist, Transportation Engineer MDM Transportation Consultants, Inc. 28 Lord Road, Suite 280 Marlborough, MA (508)

49 Neighborhood Context

50 Study Locations

51 Daily Traffic Volumes

52 Existing Volumes (7:30-8:30 AM) Vehicular Volumes Pedestrian & Bicycle Volumes

53 Existing Volumes (4:45-5:45PM) Vehicular Volumes Pedestrian & Bicycle Volumes

54 Existing Volumes (12:00-1:00 PM) Vehicular Volumes Pedestrian & Bicycle Volumes

55 Existing Travel Speeds Regulatory (Prima-Facie) Travel Speed = 30 mph

56 Intersection Layout

57 Traffic Signal Sequence

58 Collision Diagram

59 Crash Data Sheet 1 of 3

60 Crash Data Sheet 2 of 3

61 Crash Data Sheet 3 of 3

62 Crash Data - Graphs

63 Conceptual Improvements Plan