In sync with Bicycling Magazine naming New York America’s best biking city, the NYC Department of Transportation released a report this week full of stats on the safety impact of protected bike lanes. It’s the most robust data the city has released about this type of street design, and the results prove that protected bike lanes make streets safer not just for cyclists, but pedestrians and drivers as well.
For this analysis [PDF], DOT looked at protected bike lanes in Manhattan with at least three years of post-implementation crash data: segments of Broadway and First, Second, Eighth, Ninth, and Columbus Avenues. These streets saw big growth in cycling and major improvements in cyclist safety. The safety benefits extended to all road users, with total traffic injuries dropping 20 percent and pedestrian injuries down 22 percent.
The biggest improvement on these streets is in the diminished likelihood that a cyclist will suffer an injury — a metric DOT calls “cyclist risk.” Because injuries tended to fall or hold steady while cycling increased, most of the streets saw cyclist risk drop by more than a third. On Broadway from 59th Street to 47th Street, for example, bike volumes jumped 108 percent while crashes with injuries fell 18 percent.
The best results were on Ninth Avenue between 23rd and 16th Streets, where cyclists were 65 percent less likely to be hurt after the protected bike lane was installed. Only one of eight segments, Broadway between 23rd and 18th Streets, saw an increase in cyclist risk.