NHTSA picks cyan lights to mark driverless cars on public roads

The National Highway Traffic Safety Administration has proposed requiring autonomous vehicles to display cyan-colored marker lamps, creating a standardized signal that a vehicle is operating without a human driver¹. The proposed rule rewrites Federal Motor Vehicle Safety Standard (FMVSS) No. 108 to accommodate autonomous vehicle designs, both removing requirements tied to human-operated controls and establishing how robotaxis communicate their status to law enforcement and other road users².