NHTSA Proposes Cyan Indicator Lights for Robotaxis

The proposal aims to signal autonomous operation mode using a distinct, standardized lamp color for other road users.

Updated on Oct. 23, 2026 in Electric Vehicles

NHTSA Proposes Cyan Indicator Lights for Robotaxis

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Do you believe robotaxis should be required to display visual indicators while driving in driverless mode?

The National Highway Traffic Safety Administration has proposed requiring robotaxis to display cyan indicator lamps when operating in driverless mode. This measure intends to clearly communicate when an Automated Driving System is engaged.

Why it matters

The proposal seeks to increase confidence in autonomous vehicles among other road users by using a color distinct from existing standardized lighting. It aims to address safety regulation gaps and prevent confusion on public roads.

The proposed indicator lamps provide 360-degree visibility to signal autonomous status. Researchers validated the approach using five vehicles over a two-year on-road study.

The players

National Highway Traffic Safety Administration

This federal agency is responsible for establishing safety standards for motor vehicles and equipment sold in the United States.

Mercedes-Benz

This multinational luxury automotive manufacturer conducted the on-road validation study for the marker lamps in California.

The details

NHTSA intends for the cyan color to avoid conflict with colors already defined in FMVSS No. 108, such as red, amber, or white. The color specifically conforms to the definition found in SAE J578.

Mercedes-Benz conducted a two-year validation study from 2023 to 2025.
The NHTSA published the official proposal on October 23, 2026.

Roadmap

This proposal marks a shift toward standardizing communication between autonomous systems and human road users to ensure long-term integration. It follows the regulatory evolution established by FMVSS No. 108 to accommodate modern vehicle autonomy.

Drivers may soon see these cyan lights on public roads as a visual cue for identifying driverless vehicles. This standardized notification is designed to improve clarity and safety during everyday interactions with autonomous fleets.

The takeaway

Standardizing lighting for autonomous vehicles could clarify road interactions and improve public safety expectations. Identifying these vehicles by their light signature may eventually become a standard part of defensive driving.