The National Highway Traffic Safety Administration has proposed a new federal standard requiring driverless vehicles to use cyan-colored marker lamps. This rule aims to provide a consistent visual signal to surrounding traffic that no human is operating the car. The agency released these changes as part of a revision to Federal Motor Vehicle Safety Standard No. 108. The update specifically rewrites existing rules to accommodate autonomous vehicle designs. By standardizing the use of blue-green lights, NHTSA seeks to replace previous debates over flashing text or audio alerts with a single, clear indicator. The proposal combines regulatory adjustments for human-free vehicle configurations with this specific communication requirement.