Roundabouts in Small-Medium Sized Communities: Why Consider Them?
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1 Roundabouts in Small-Medium Sized Communities: Why Consider Them? PRESENTORS: Dave Kliewer, PE J-U-B Engineers, Spokane Manager Spencer Montgomery J-U-B Engineers, Transportation Planner Roger Krieger - Public Works Director, City of Deer Park Brian Walsh, PE WSDOT HQ Traffic Engineer 1 Focus today on small medium sized towns and mainly single lane roundabouts ROUNDABOUTS HAVE SOME ADVANTAGES Superior safety record over signalized intersections Maintenance considerations Pedestrian benefits 2
2 Truck aprons can be used to help facilitate truck movements while still keeping speeds slow for small vehicles th Avenue & Union Street Roundabout Kennewick, WA The City s first modern roundabout for two intersections in close proximity to one another. Union Street provides access to Southridge High School. the jury is in and we have declared it [roundabout] wonderful. The flow of traffic slows a bit at peak congestion times, but it keeps moving! The most important improvement is the reduction in accidents. Our security staff was at the old intersection at least twice a week to assist with student accidents, some of them quite serious. This year we haven t had to deal with any accidents at the 27 th and Union intersection and we couldn t be happier. Love it or hate it, the roundabout is working for Southridge. Southridge High School Newsletter, December 2000, Vol. III, Issue 3. Two years prior to the roundabout, 28 reported crashes Two years after after only 6 reported rear-end accidents approaching the roundabout none in the actual roundabout and all minor fender benders. (City of Kennewick Newsletter.) 4
3 Legend Single lane roundabout Double lane roundabout Planned roundabout City of Kennewick 5 Some Benefits of Roundabouts Addresses Peak Hour issues when signal warrants are not met More flexibility with available Right-of-way Life Cycle costs typically lower Lower accident rates Less severe accidents 6
4 Studies by the FHWA and Insurance Institute for Highway Safety have shown that roundabouts typically achieve: A 37 percent reduction in overall collisions A 75 percent reduction in injury collisions A 90 percent reduction in fatality collisions A 40 percent reduction in pedestrian collisions 75 percent fewer conflict points than a traditional intersection 7 City of Pasco evaluated both traditional improvements and roundabout. Decided a traditional intersection was more appropriate. 8
5 City of Richland evaluated both traditional and roundabout improvements in a corridor. Selected a combination of improvement types. Queensgate Drive Corridor Evaluation Criteria: Level of Service Bike/Ped Accommodations Access Management Right-of-Way Cost 9 DEER PARK, WASHINGTON Crawford Avenue/Weber Road Intersection Traditional Traffic Signal Improvements vs. Roundabout Concept 10
6 Crawford/Weber Intersection Comparison of Alternatives Feature Compared Short Term Traditional Intersection Improvements Alternative (Signalization w/turn lanes) would not meet signal warrants, as unsignalized (with left turn lanes would provide LOS "D" Roundabout Alternative minimal delay, LOS "A" Traffic Operations Long-term LOS "C" LOS "F" for WB approach, "E" for EB, "C" for NB, "A" for SB Other off-peak delay caused by signal or stop signs off-peak traffic has minimal delay Right-of-Way minimal, likely < than 500 sq ft 10,000-12,000 sq ft Vehicle Conflicts 32 conflict points (16 are crossing paths) 8 conflict points, all merging/diverging movements Safety Pedestrian Conflicts Accident Severity 16 conflict points, pedestrian must 8 conflict points, pedestrian only be aware of 3 different directions of needs to look one direction traffic vehicles slower, conflicting higher accident rates as Two-Way movements less severe therefore Stop Controlled or as Signalized than fewer injury accidents than Roundabout either TWSC or signalized intersections 11 Feature Compared Traditional Intersection Improvements Alternative (Signalization w/turn lanes) Roundabout Alternative Construction $420,000 $337,000 Costs Annual Maintenance Traffic signal equipment, power, approximately $4,500 Minimal Life Cycle $28,016/year $16,161 Trucks specific design to accommodate truck turning movements is provided where necessary not ideal for high truck volume corridors, trucks can be accommodated with truck aprons Other Pedestrians specialized traffic signal features can be incorporated to accommodate the visually impaired accommodations for the visually impaired are more challenging but have been developed Minor Street Approaches close access points north and will not require left turn lanes south of the intersection will approaching the intersections, likely make for short left turn allowing for less conflict storage lengths approaching the between left-turning vehicles on intersections the north and south legs 12
7 DEER PARK CASE STUDY Crawford Avenue/Weber Road Busiest intersection in town Development pushing poor LOS Traffic Mitigation Ordinance No Traffic Signals in Town Elementary and High Schools nearby Public and Elected Officials reluctance Study performed to compare traditional Traffic signal with Roundabout Presented results at Open House with Elected Officials and Public Council voted 3-2 in favor of roundabout 13 Even with winter maintenance issues Deer Park experience is very positive 14
8 Still no traffic signals We re working on our 3 rd Roundabout Word to the Wise - Don t let ROW control decision - smaller is not necessarily better 15 Mattawa WA 16
9 17 18
10 19 20
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13 Sultan WA 25 26
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15 29 30
16 Montana City MT 31 Montana City BEFORE 32
17 Montana City AFTER 33 34
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19 Public Involvement was very important. Construction next spring! To see traffic simulation video on how to navigate the roundabouts. 37 Lessons Learned Don t skimp on public involvement budget. Selecting the right Community Advisory Committee members is very important. Being open about the possibility of roundabout alternatives early on, gets the discussion going. WSDOT s willingness to provide roundabout education to the community, both at the CAC level, as well as the Open House, was tremendously helpful. Keeping the public current, both with the project website and public meetings, provides ownership. Keep the elected officials briefed and current. 38
20 Roundabouts in Small-Medium Sized Communities: Why Consider Them? QUESTIONS? Let s talk about issues and concerns. What are obstacles to considering and constructing roundabouts? 39
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