New York City's lower 25 mph (40 kph) speed limit is now the law. It went into effect today.
It applies to all locations where a maximum speed is not posted.
The new law cuts the speed limit from 30 mph (48 kph).
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The city is replacing about 3,000 speed signs.
The 25 mph (40 kph) speed limit affects about 90 percent of the city's streets.