The Department of Transportation wants to help New York City motorists do a better job watching how they drive. And the DOT wants to watch, too.

The agency will launch a federally funded pilot program this fall to equip up to 500 city motorists with transmitters that collect data from their car's onboard computers. The data will flow to certain smartphone apps, supplying drivers with statistics on everything from gas mileage to the average speeds at which they move through city traffic.

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