FMCSA Reviews Warning Triangle Exemption Request
A new federal notice set for April 15, 2026, shows the Federal Motor Carrier Safety Administration (FMCSA) is reviewing a request that could change warning triangle rules for some trucks.
The notice asks for public comment on an application from Aurora Operations, Inc. The company is seeking a five-year exemption tied to trucks with advanced automated driving systems (ADS).
Aurora Seeks Alternative to Warning Triangle Use
Aurora wants to use a different method when trucks stop on the road.
Today, federal rules require drivers to place a warning triangle or use fusees when a truck stops on the shoulder or roadway. These rules apply when the stop is not part of normal traffic.
Aurora is asking to replace the warning triangle with cab-mounted warning beacons. These beacons would be installed on trucks with Level 4 ADS.
The company also wants the exemption to apply to other carriers. Those carriers would need to notify FMCSA in writing before using it.
Current Warning Triangle Rules for Stopped Trucks
FMCSA rules set clear steps for stopped commercial vehicles.
Drivers must turn on hazard flashers right away. They must also place warning devices within 10 minutes. This includes the use of warning triangles placed both in front of and behind the truck.
The rules also explain how far away the warning triangles must be placed. This can change based on road conditions. For example, different rules apply on curves or hills.
Other rules require that exterior lights stay steady. They also list the exact types of warning devices that must be used.
Aurora is asking for an exemption from parts of these rules.
How the System Would Replace the Warning Triangle
Aurora’s plan uses flashing amber lights mounted on the truck cab.
These lights would be placed high on both sides of the cab. They are designed to be easy to see from a distance.
The system would turn on when the truck stops. It would replace the need to place warning triangles on the road.
Aurora says this method could improve safety. It removes the need for a person to exit the truck and walk near traffic.
Current Waiver Allows Limited Warning Triangle Replacement
Aurora is already using a similar system under a temporary waiver.
This waiver allows the use of cab-mounted beacons instead of the standard warning triangle and other required devices. It also applies to other companies using Level 4 ADS trucks. Those companies must notify FMCSA and meet certain conditions.
One company, Kodiak Robotics, has already joined under this waiver.
The waiver includes strict rules. Carriers must report crashes if they happen while the system is active. They must also share performance data.
So far, no crashes have been reported under the waiver.
The current waiver is set to expire on July 9, 2026.
Safety Data on Warning Triangle Replacement System
Aurora shared data from its use of the system.
The company said 34 Class 8 trucks used the beacons during testing. These trucks traveled more than 500,000 miles between October 2025 and January 2026.
During that time, the beacons were active for nearly 10 hours in total.
Aurora reported no crashes while the beacons were in use. The company also said the system worked as expected. It reported no faults or power issues.
Aurora also pointed to two studies that support replacing the warning triangle with beacon systems.
Fleet Growth and Future Plans
Aurora currently operates 109 Class 8 trucks.
The company expects to grow its fleet to more than 200 Level 4 ADS trucks by the end of 2026.
Over time, the company believes this number could reach thousands. That growth would depend on approval of the exemption.
Aurora also wants to expand the types of trucks covered. This includes double and triple trailers and tank vehicles. These are not allowed under the current waiver.
The company does not ask to include operations that require certain endorsements. This includes hazardous materials or passenger endorsements if a human driver is present.
FMCSA Review of Warning Triangle Rule Change
FMCSA has not made a decision yet.
Federal law requires the agency to publish the request and collect public comments.
The agency will review several things. This includes Aurora’s application, its safety data, and comments from the public.
To approve the request, FMCSA must find that the new system is as safe as current rules. It must also meet or exceed current safety levels.
What This May Mean for Truck Drivers
If approved, this change could affect how some trucks handle roadside stops.
Drivers of ADS-equipped trucks may not need to leave the cab to place a warning triangle. This could reduce risk in busy traffic or poor weather.
The change would only apply to Level 4 ADS trucks at first. Most drivers on the road today would not be affected right away.
Still, the request shows how technology is changing the trucking industry. Over time, similar systems could be used more widely. This could lead to changes in future safety rules.
Comment Period and Next Steps
FMCSA is accepting public comments for 30 days after the notice is published.
After that, the agency will review all input. It will then decide whether to grant or deny the exemption.
If approved, the exemption would include specific rules and conditions. It could remain in place for up to five years.
Vincent ShakirApril 14, 20263 Mins read324
