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This is already in place in the marine world. Commercial ships for years have had to have an AIS transponder. It transmits the ship hailing info as well as course and speed. This has started to expand into the recreational boating world starting with AIS receivers that show those ships on a chartplotter. The price for receivers and transponders is coming down and creeping more into the recreational boating realm.
A lower powered automated system for cars just makes sense.