Last year New York City lowered the speed limit in the city to 25 mph. Recently Mayor Bill DeBlasio credited that effort, along with the larger “Vision Zero” campaign, for the lowest number of pedestrian fatalities since 1910 which is huge considering it was 1910 and the vehicles produced back them probably topped out at like 25 mph anyway.
San Francisco is now considering one upping (or one lowering) New York City and lowering the speed limit to 20 mph in some areas. From The SF Examiner:
The report stated that in 2011, there were 3,111 collisions in The City that resulted in injury. Of those, 844 were between vehicles and pedestrians and 630 were between vehicles and bicyclists, or 27 and 21 percent of total collisions with injuries, respectively.
Of the 28 fatal collisions that occurred in 2011, 17 were between vehicles and pedestrians and four were between vehicles and bicyclists.
A study of 20 mph zones in the London metropolitan area saw a 40 percent decrease in collisions, the budget analyst report said. The report found that “the combination of reducing speed limits in the City through advocating for a change in State law, enhancing speed limit enforcement and installation of traffic calming measures would be most effective at reducing vehicle speed and collisions.”