NYC is reducing speed limits to 20 mph in 13 neighborhoods throughout the city. Lower speeds for cars make it safer for pedestrians–a collision with a vehicle traveling at 20 mph is 35% less likely to be fatal than one in which the car is going 30 mph.
NYC Will Expand 20 MPH Zones to 13 Neighborhoods, With More to Come.
Feet First Philly 
This is great news! I was under the impression that such speed limit changes can be very difficult to implement due to conflicting traffic agencies (PennDOT), but perhaps Philly could be next?
As I commented on the original post, I think it’s important to also spin this as pro-motorist. Low urban speed limits greatly benefit drivers, pedestrians, and cyclists alike. For more information on that, see this document from the UK.
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