A line of Audi A4 cars are parked before a demonstration of Audi's vehicle-to-infrastructure technology Tuesday, Dec. 6, 2016, in Las Vegas. The technology allows vehicles to "read" red lights ahead and tell the driver how long it'll be before the signal turns green. For the driver, the system puts a traffic signal icon on the dashboard telling how many seconds the light will remain red. (AP Photo/John Locher)
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