Left Turn Traffic Calming is a citywide program focused on reducing left turn speeds and enforcing safe turning behavior. The program is part of the overall Vision Zero initiative to eliminate traffic fatalities, severe injuries and reduce the number of traffic injuries.
DOT initiated the program as part of the Left Turn Study Action Plan to address failure to yield crashes caused by left turning vehicles. Read more about the Left turn Study. The office of Research, Implementation & Safety manages the program and installed treatments on 107 citywide intersections in 2016 as well as 110 intersections in 2017.
DOT selects feasible locations after checking against several criteria involving crash injury numbers, lane configuration and effect on large vehicles’ turning movements. View a list of Left turn Traffic Calming installations across New York City’s five boroughs
Also view an interactive map of all 2016 & 2017 citywide Left Turn Traffic Calming installations along with other relevant safety information.
Left Turn Traffic Calming Treatments
Left Turn Traffic Calming treatments are installed in a variety of intersection configurations, but in all cases these treatments are designed to address problematic left turns
In New York City intersections where Left Turn Traffic Calming Treatments have been implemented, median left turn speeds have decreased by 19.9%. Average left turn speeds have decreased by 20.5%. 85th percentile left turn speeds have decreased by 16.7% and maximum left turn speeds have decreased by 11.7%. Vehicles are making safer turns as well; the rate of crossing the double yellow line while turning has dropped by 78.9% for locations that have a treatment extending to the stopbar and 100% for locations that have a treatment extending all the way to the crosswalk. DOT expects to see a reduction in traffic injuries once enough before/after crash data becomes available.
2018 Program Planning
DOT is currently planning Phase 3 of this program where additional intersections will be selected for treatment installation across the city.