Cyan Lights Proposed for Robotaxis

The debate over how to visually identify driverless vehicles has reached a specific, if somewhat arbitrary, conclusion.

Federal regulators have proposed a standardized cyan marker light for autonomous vehicles. The National Highway Traffic Safety Administration released changes to Federal Motor Vehicle Safety Standard No. 108 to accommodate these new designs. The goal is to create a uniform signal that tells law enforcement and other road users when a machine, rather than a human, is in control.

The choice of cyan is driven by visual necessity. Current automotive lighting relies heavily on red, amber, white, and flashing blue or red colors for functions like braking, turning, and emergency alerts. By introducing a blue-green hue, the agency aims to fill a visual gap without causing confusion among drivers who are already accustomed to other colors.

There is some precedent for this approach, though it has been uneven. Mercedes-Benz previously received state-level approval for turquoise lights on its Level 3 Drive Pilot vehicles. However, the automaker later abandoned that specific idea in favor of a Level 2++ system. NHTSA now seeks to establish a national standard that companies like Waymo, Nuro, Zoox, GM, and Mercedes can adopt consistently.

Under the proposed rule, these cyan lights would remain optional for manufacturers. The primary objective is to standardize the color, brightness, and placement for those who do choose to install them. This prevents a fragmented landscape where different companies use varying colors or signals, potentially creating uncertainty on the road.

The proposal also addresses internal vehicle controls that may not apply to driverless cars. Current regulations require physical hazard switches, manual beam shifters, and turn levers. NHTSA proposes removing these requirements to align with modern autonomous designs. The agency is also updating testing standards for 12.8-volt systems to accommodate LED architectures and is considering removing rules about the vertical placement of high-beam lights relative to low-beam lights.

This move fits into a broader Department of Transportation effort to streamline the deployment of autonomous vehicles. The administration aims to reduce administrative barriers for automakers building cars without traditional human controls like steering wheels and pedals. The focus is on creating a regulatory framework that reflects the reality of modern engineering.

However, the path to full autonomy remains complex. Regulators are still enforcing existing rules strictly while new standards are debated. Last month, NHTSA initiated an audit query regarding the Tesla Cybercab. The investigation focuses on the technical data Tesla used to certify the vehicle, particularly concerning the absence of sideview mirrors, pedals, and a steering wheel, all of which are currently required under FMVSS.