Hundreds of New York City crosswalks are getting pedestrian countdown clocks.

Mayor Michael Bloomberg’s administration studied the signals in a pilot program of 24 intersections. The city found that the countdown clocks were particularly helpful on wide streets with longer crosswalks.

Starting this month, 1,500 intersections will get the clocks, which are common in cities around the country.

The city chose intersections based on their roadway width and high rates of accidents with pedestrian injuries.

Officials said the countdown clocks will be standard for all new signals on wider streets.

Bloomberg’s administration also announced other measures to improve pedestrian safety. Those include a pilot program of 20 mph speed zones in some residential areas.

The city’s standard speed limit is 30 mph