That&#x27;s a clever solution. Many lights have moved over to arrays of colored LEDs. The bulbs themselves could transmit data, similar to LiFi, to cars. The LED arrays could also have a LiFi receiver.<p>To prevent hacking, the data transmitted by the traffic lights could be digitally signed using the public key of the jurisdiction. If 2 way communications is required, vehicles could sign their data with a vehicle key too.<p>Something like this would be a good way to securely allow lights to change their behavior when emergency vehicles or mass transit vehicles approach, broadcast road warnings to all vehicles, broadcast amber alerts. It could also receive reports from vehicles on average speed in road segments, reports of icy conditions (from vehicle traction feedback), reports of potholes or other maintenance issues, etc.