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V2V

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The U.S. Department of Transportation has issued a proposed rule that would require vehicle-to-vehicle technology, or V2V, to be standard on all cars.

There's a 90-day public comment on the proposal.

V2V technology allows cars to send wi-fi signals to each other, and another feature, automatic braking –which U.S. automakers have already voluntarily agreed to make standard – prevents crashes based on the signals.