SPEED MANAGEMENT FOR VISION ZERO
LUANN HAMILTON, DEPUTY COMMISSIONER FOR PROJECT DEVELOPMENT CHICAGO DEPARTMENT OF TRANSPORTATION | NACTO DESIGNING CITIES 2017 “Driver speed is the most important factor in determining Vision Zero Action Plan crash risk and crash severity.” p. 46 Speed management and speeding prevention is a special focus of the Vision Zero Chicago Action Plan, released in June 2017 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 Speed of Chicago’s Management Automated through Design Speed & Engineering Enforcement 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
150 automated speed enforcement cameras 2012 2017 installed at prioritized locations throughout the City City of Chicago Severe crashes permits decreased 11% at automated speed speed camera enforcement locations vs. a 2% following state law increase citywide passage Within one week of speed camera activation, average speeds Automated Speed decreased 13% at camera Enforcement locations. Cameras cause an immediate change in By the end of the second driver behavior that month, violations increases over time. decreased 53% compared with the first week. 25% 20% 20% Total 15% Crashes 10% 10% Youth Related Serious & Fatal 4% - 13 to2014 - 15 5% 2% Bike & Ped 1.7% 0% -0.30% Speed -5% -4% Related -10% -8% -15% -11%
% change, 2012 -20% -17% 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 CDOT uses design changes to discourage speeding behaviors and Designing for safety reduce the incidence of speeding. Even simple design and engineering changes can In some cases, the City’s have strong impact on municipal speed limit of street usage. 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 Speeding Drivers: Vincennes Before 150
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 Speeding Drivers: Vincennes After 80
60
40
20
0 Before After Speeding Exceeding 40MPH Build Complete Streets
20’ Travel Lane + 11’ Travel Lane Parking Lane 55TH STREET COTTAGE GROVE TO LAKE PARK
Build Complete Streets 10’ Turn Lane 11’ Travel Lane 20’ Travel Lane + 11’ Travel Lane Bikes % over Parking Lane ADT (peak) 30mph
Before 13,712 89 24% 55TH STREET COTTAGE GROVE TO LAKE PARK 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 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 Before Reduced signed speed After limit to 20MPH from 25-30MPH along corridor
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 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. Before “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. 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. Before 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