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December 21, 2014

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This May 22, 2012, file photo shows a side mirror warning signal in a Ford Taurus at an automobile testing area in Oxon Hill, Md. Federal officials want automakers to equip new cars and light trucks with technology that enables vehicles to communicate with each other to prevent collisions.

Susan Walsh / AP

This May 22, 2012, file photo shows a side mirror warning signal in a Ford Taurus at an automobile testing area in Oxon Hill, Md. Federal officials want automakers to equip new cars and light trucks with technology that enables vehicles to communicate with each other to prevent collisions.