US Approves 5-Year Exemption for Autonomous Truck Warning Devices

en.Wedoany.com Reported - On October 7, the U.S. Federal Motor Carrier Safety Administration (FMCSA) granted autonomous technology company Aurora and other eligible operators a five-year regulatory exemption for safety equipment, allowing commercial trucks equipped with L4 autonomous driving systems to use high-visibility warning lights installed in the cab instead of traditional reflective warning triangles and other devices when parked. The exemption is valid until October 7, 2031.

This exemption involves Sections 392.22(b), 393.25(e), and 393.95(f) of the U.S. Federal Motor Carrier Safety Regulations, covering requirements for the placement of parking warning devices, continuous illumination of lamps, and configuration of warning equipment. Under the terms of the exemption, relevant vehicles must activate cab warning lights within 5 minutes of parking and maintain the normal operation of existing hazard warning flashers. Traditional rules generally require drivers to place roadside warning devices within 10 minutes of parking.

Vehicles approved to use the alternative solution must operate within a validated autonomous driving operational design domain. Other eligible operators must submit written notice and equipment configuration information to the regulatory agency before using this solution. The exemption does not apply to passenger transport or hazardous materials transport requiring specific driving qualification endorsements, and there are also restrictions on the use of long combination vehicles.

Aurora and Waymo jointly applied for a similar exemption in 2023, but the broader application was rejected in 2024. Aurora subsequently submitted a new five-year exemption application separately in 2025 and obtained temporary operating authorization, which was converted into this formal approval after multiple extensions.

Regulatory review materials included warning device testing conducted by Aurora and the Virginia Tech Transportation Institute. In 6 of 8 test scenarios, drivers responded to in-vehicle warning lights by decelerating or changing lanes earlier than they did to traditional warning triangles. During the temporary exemption period, relevant vehicles accumulated over 500,000 miles of driving, with warning lights activated for a cumulative total of nearly 10 hours, and regulators found no adverse safety impacts resulting from this.

Operators must submit annual warning device operation reports, documenting equipment failures, power supply issues, and traffic accidents involving the activation status of the devices. If actual operations fail to meet the required safety levels, the regulatory agency may revoke the exemption eligibility of all or individual operators.