The exemption covers federal requirements on the type and number of warning devices, where they must be placed and the use of steady-burning lamps.
Aurora Innovation applied for the exemption in April, but other carriers operating Level 4 trucks can take advantage of it if they notify FMCSA before starting.
“High-visibility, cab-mounted warning beacons are a critical, 21st-century solution that enhances roadside safety by immediately alerting other road users without ever needing to put a person in harm's way.
The Autonomous Vehicle Industry Association and Volvo backed warning beacons for trucks with and without drivers, arguing they keep people off the roadways in dangerous conditions.
In a statement, Todd Spencer, president and CEO of OOIDA, said the beacons fall short as a substitute for warning triangles across those conditions.