Most street legal vehicles utilize a combination of three colored lights: white for headlights and reverse lights, red for tail and brake lights, and orange for blinkers....
Mercedes-Benz debuts turquoise exterior lights to indicate the car is self-driving | A visual indicator for other drivers::undefined
That would be great for the driver himself. The amount of times I've had to play leap frogs with someone only to be given a dirty look when hes the one that constantly slows down and accelerates.