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For the curious, there is a system built-in to every modern aircraft called TCAS ( http://en.wikipedia.org/wiki/Traffic_collision_avoidance_sys... ), Traffic Collision Avoidance System, that does something similar for airplanes.

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TCAS is definitely useful but it's not be-all end-all in collision avoidance, and unfortunately I think that translates well to automobiles as well. There's always the possibility of failure with the devices or perhaps sending erroneous(perhaps malicious) data that could screw with the system in other people's cares.

That said, I do like seeing these kinds of innovations!

Yes, a very tragic example that happened quite close to where I live was a mid air collision between a freighter and a regular airliner ( http://en.wikipedia.org/wiki/2002_%C3%9Cberlingen_mid-air_co... ), with 71 fatalities.

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