Cyan Lights on Driverless Trucks

Sam Aguiar Injury Lawyers • October 28, 2026 • 2 Min Read

Semi truck on a highway at dusk — Illustrative truck photograph from the firm’s existing media library.

Identifying Automated Vehicles

NHTSA has proposed optional cyan marker lights to identify when an automated driving system is operating a vehicle. The blue-green lights would give motorists and emergency responders a common signal for recognizing automated operation. The optional marker-lamp specifications were announced October 23, and the proposed rule was published October 26, 2026. Comments close November 25.

Lamp Activation Requirements

The proposed activation conditions call for steady-burning lamps. They may activate when the vehicle operates without an occupant expected to monitor the roadway and must deactivate when that expectation changes. The proposal also addresses placement, brightness and visibility, while seeking comment on flashing signals. Installation would remain optional.

Requirements and Limits
Authority	Applicable Condition	Issue
AuthorityFederal Agency Action	Applicable Condition Installation Optional under the proposal	IssueInstallation
AuthorityFederal Agency Action	Applicable Condition Signal Automated operation under specified conditions	IssueSignal
AuthorityFederal Agency Action	Applicable Condition Absent Lamp Does not establish human operation	IssueAbsent Lamp
AuthorityFederal Agency Action	Applicable Condition Current Status Proposed rule; comments due November 25, 2026	IssueCurrent Status

Source: Federal Agency Action.

Controls on Driverless Vehicles

Separate provisions concern vehicles built without manually operated driving controls. Certain manual switches and dashboard indicators would no longer be required, but the corresponding signaling functions would remain. The proposed turn-signal and headlamp controls would still need mechanisms that operate the lamps.

Automated Driving Status

The absence of a cyan lamp cannot establish that a person was driving, because installation would be optional. In self-driving truck accident cases, investigators would need vehicle-specific information about the equipment and operating mode. Video of a lamp can identify a question to investigate, but the vehicle’s recorded system status, if available, must be examined before reaching a conclusion.

Proposed Federal Lighting Rules

These lighting provisions have not taken effect. They address communication during automated operation and do not establish a measured crash reduction. They also serve a different purpose from warning beacons on stopped driverless trucks, which concern roadside breakdown warnings. The final lighting rule will determine which activation and visibility conditions become binding.

Injuries Involving an Automated Truck

A truck’s operating mode is one part of a serious accident investigation. If an automated truck caused your injuries, our truck accident team can review the circumstances and take over your case. Start with a free case review.

CALL NOW