SPEED MANAGEMENT FOR VISION ZERO LUANN HAMILTON, DEPUTY COMMISSIONER FOR PROJECT DEVELOPMENT CHICAGO DEPARTMENT OF TRANSPORTATION NACTO DESIGNING CITIES 2017
Vision Zero Action Plan Speed management and speeding prevention is a special focus of the Vision Zero Chicago Action Plan, released in June 2017 Driver speed is the most important factor in determining crash risk and crash severity. p. 46
Focusing on Speeding as Dangerous Driving Vision Zero Chicago s highest priority dangerous driving behavior is speeding. p. 48
Two methods for speeding prevention Proven Success of Chicago s Automated Speed Enforcement Speed Management through Design & Engineering Changes
Proven Success of Chicago s Automated Speed Enforcement Automated Speed Enforcement has been proven in the City to greatly reduce speed by targeting habitual dangerous speeding behavior in data-driven deployments. p. 49
Automated Speed Enforcement 2012 City of Chicago permits automated speed enforcement following state law passage 150 automated speed enforcement cameras installed at prioritized locations throughout the City 2017 Severe crashes decreased 11% at speed camera locations vs. a 2% increase citywide
Automated Speed Enforcement Cameras cause an immediate change in driver behavior that increases over time. Within one week of speed camera activation, average speeds decreased 13% at camera locations. By the end of the second month, violations decreased 53% compared with the first week.
% change, 2012-13 to 2014-15 25% 20% 15% 10% 5% 0% -5% -10% -15% -20% Total Crashes -4% 10% Serious & Fatal -11% 2% Bike & Ped -17% -0.30% 1.7% 20% Speed Related Youth Related -8% 4% Speed Camera Zones Citywide
What s Next for Automated Enforcement? In partnership with community leadership, Aldermen, and residents, ASE will be studied as an option to curb dangerous speeding p. 49
Designing for safety Even simple design and engineering changes can have strong impact on street usage. CDOT uses design changes to discourage speeding behaviors and reduce the incidence of speeding. In some cases, the City s municipal speed limit of 30MPH is still too high for conditions, so CDOT is reviewing corridors for signed speed limit changes.
Speed Management through Design & Engineering Changes In every construction project, CDOT is committed to building safe streets that provide multimodal transportation choices for all Chicagoans. p. 56
Vincennes Avenue Arterial Resurfacing 981 Crashes in five years, resulting in 206 injuries and four deaths. The community identified speeding as a major concern on the corridor. Before 150 Speeding Drivers: Vincennes Before 100 50 0 Northbound Southbound Speeding Exceeding 40MPH
Vincennes Avenue Arterial Resurfacing Reduced 22.5 foot lane width to 10 feet to accommodate a buffered bike lane. No changes to the speed limit or roadway capacity. Before After
Vincennes Avenue Arterial Resurfacing 100 80 60 40 20 Speeding Drivers: Vincennes After 0 Before After Speeding Exceeding 40MPH
Build Complete Streets 20 Travel Lane + Parking Lane 11 Travel Lane 55 TH STREET COTTAGE GROVE TO LAKE PARK
Build Complete Streets 11 Travel Lane 10 Turn Lane 20 Travel Lane + Parking Lane 11 Travel Lane ADT Bikes (peak) % over 30mph 55 TH STREET COTTAGE GROVE TO LAKE PARK Before 13,712 89 24% After 13,783 171 5.4%
What s next for optimizing construction opportunities? By using data to target interventions, the City can ensure that its limited resources will be spent where and how they will best maximize safety benefits.
Speed Management through Design & Engineering Changes Improving safety on the City s most dangerous streets is the highest priority for Vision Zero engineering projects. p. 34
Before Milwaukee Avenue Vision Zero High Crash Corridor Six-point intersections with difficult pedestrian crossings, high pedestrian volumes, highest bike volumes in the City. Determined to be best location to pilot an interim treatment -- paint and post project -- that was designed, funded and built within a 6-month period.
Before Milwaukee Avenue Vision Zero High Crash Corridor Reduced signed speed limit to 20MPH from 25-30MPH along corridor After Shortened crossing Added dashed bike lanes as a pilot project
Milwaukee Avenue Vision Zero High Crash Corridor Improved pedestrian infrastructure to accommodate large volumes, decrease crossing distances, and improve visibility and predictability. Before After
Milwaukee Avenue Vision Zero High Crash Corridor Closed slip lane with low turning volumes and high pedestrian crossing volume. Possibility for programming added for community groups. Before After
What s next for Corridor-based speed management? Identify opportunities to reduce the posted speed limit and create recommendations that would prioritize reduced speeds on neighborhood streets and pedestrian, bicycle, and transit priority areas. p. 46
Placemaking with Slow Speeds Well-designed and programmed streets provide more than mobility for all modes of transportation; they also support local economic development. p. 36
Before Argyle Street Placemaking with Slow Speeds Argyle Street is a thriving Asian community on Chicago s North Side. The street is used for a weekly night market, and visitors frequently access multiple locations along the corridor. It was identified as a good location for a shared street. Shared street means a public right of way which can be shared at the same time by pedestrians, bicyclists, motor vehicles and other legal conveyances, and where pedestrians have the right of way over all other traffic.
Argyle Street Placemaking with Slow Speeds The shared street was designed for 10MPH, a speed significantly lower than the Citywide speed limit, utilizing chicanes and tactile cues for speed management.
Before Argyle Street Placemaking with Slow Speeds Closed slip lane with low turning volumes and high pedestrian crossing volume. Possibility for expanded programming by business/community groups. After
What s next for placemaking with slow speeds? Leverage safety improvements as an opportunity for additional community investment, safety awareness, and economic development activities. p. 36
SPEED MANAGEMENT FOR VISION ZERO LUANN HAMILTON, DEPUTY COMMISSIONER FOR PROJECT DEVELOPMENT CHICAGO DEPARTMENT OF TRANSPORTATION NACTO DESIGNING CITIES 2017