US Regulators Propose Cyan Lighting Standard for Autonomous Vehicles

The National Highway Traffic Safety Administration (NHTSA) is moving to standardize how autonomous vehicles communicate their operational status to the public. Under proposed amendments to Federal Motor Vehicle Safety Standard (FMVSS) No. 108, self-driving vehicles would be required to display cyan-colored marker lamps to indicate that the vehicle is operating without a human driver.

This proposal addresses a long-standing challenge in the sector: the lack of a consistent way for pedestrians, other drivers, and law enforcement to identify the status of a robotaxi. Current designs vary widely, with some developers relying on text displays or audio alerts, leading to potential confusion on public roads. The introduction of a dedicated color is intended to provide immediate visual confirmation of the vehicle's autonomy.

Beyond standardization, the move is designed to clarify regulatory requirements for vehicles lacking traditional driver controls. By updating FMVSS 108, the NHTSA aims to remove outdated design constraints while ensuring that all automated vehicles meet a minimum threshold for external signaling.

The proposed rule change is currently undergoing review. If adopted, the regulation would apply across the United States, replacing the fragmented approaches currently employed by various autonomous vehicle companies.