FMCSA will allow Aurora and qualifying carriers to use cab-mounted warning beacons instead of traditional roadside warning devices on Level 4 automated CMVs under detailed conditions through October 7, 2031.
FMCSA published the final decision on October 9
The Federal Motor Carrier Safety Administration published Federal Register document 2026-20734 on October 9, 2026, under docket FMCSA-2026-0958. The notice grants Aurora Operations, Inc. and other qualifying motor carriers a limited five-year exemption from specified warning-device and lamp rules for Level 4 automated-driving-system-equipped commercial motor vehicles.
The exemption runs through October 7, 2031
FMCSA made the exemption effective October 7, 2026, with an expiration date of October 7, 2031. The agency may revoke it earlier if participants fail to comply, if the exemption produces a lower level of safety than the regulations, or if continuation conflicts with the statutory objectives.
Cab-mounted beacons replace roadside triangles for covered trucks
A covered Level 4 ADS-equipped CMV may use warning beacons mounted on the cab instead of placing traditional warning devices on the roadway when the vehicle is stopped under the applicable conditions. The exemption addresses the triangle-placement requirement in 49 CFR 392.22(b), the steady-burning requirement in 393.25(e), and the device types and numbers in 393.95(f).
The ordinary rules still apply to other trucks
Under the normal federal rules, a stopped CMV generally must place three reflective triangles or the permitted fusee or liquid-burning-flare alternatives, with location and timing based on the roadway. The new decision does not remove that duty for a conventional truck, a nonparticipating carrier or an automated CMV that does not satisfy the exemption.
Other carriers must notify FMCSA before using the exemption
The grant is not limited to vehicles operated directly by Aurora, but another motor carrier must provide written notice to FMCSA before beginning operations under the exemption. The notice must identify the carrier and confirm that it will operate qualifying Level 4 ADS-equipped CMVs under the terms and conditions of the decision.
Operations must stay inside the validated ODD
FMCSA requires each covered vehicle to operate within the operational design domain in which its automated driving system was tested and validated. An ODD can limit roads, geography, speed, weather, lighting or other operating conditions. The exemption is therefore not permission to deploy any automated truck on any route or in every condition.
Hazmat and passenger operations are excluded
The notice prohibits use of the exemption for an operation that would require a human driver to hold an H, X, P or S endorsement. That excludes the covered warning-beacon substitution for placarded hazardous-material, passenger and school-bus operations described by those endorsements.
The beacons have technical and placement conditions
The warning system must meet performance requirements tied to SAE J595 and the mounting, visibility, color, flash pattern and other specifications stated in the decision. FMCSA also requires redundant power. A generic rooftop light or an ordinary hazard-lamp setting does not automatically satisfy the exemption.
Activation must occur within five minutes
The decision requires the warning beacons to activate within five minutes after the covered CMV stops in the relevant situation. FMCSA contrasted that condition with the ordinary rule, which generally allows required warning devices to be placed as soon as possible and within ten minutes. The automated system must still detect the stop and activate reliably.
Participants must report system problems annually
Carriers operating under the exemption must submit annual information about beacon malfunctions and power-supply issues. The reporting condition gives FMCSA continuing evidence about performance during the five-year term and provides a basis for agency review or termination if the promised safety level is not maintained.
FMCSA received 402 comments
The agency says the docket received 402 comments from organizations and individuals. The final notice discusses support, opposition, concerns about visibility and reliability, and requests to make the relief available beyond Aurora. FMCSA concluded that the conditioned beacon system would likely achieve an equivalent or greater level of safety.
Aurora reported more than 500,000 waiver miles
According to the notice, Aurora operated 34 CMVs for more than 500,000 miles under an earlier waiver and accumulated nearly ten hours of beacon activation. Aurora reported no beacon faults or power issues and no collisions involving its vehicles while stopped on the roadway. Those figures are company-reported evidence summarized by FMCSA, not a guarantee of future performance.
The decision does not authorize driverless trucking generally
The exemption concerns a narrow set of parts-and-accessories and stopped-vehicle warning requirements. It does not create nationwide operating authority for autonomous trucks, preempt every state or local rule, approve a particular freight service, waive vehicle-maintenance duties or change CDL requirements for operations that still use a human driver.
Fleets should verify participation before changing procedures
A carrier should confirm that the vehicle is Level 4 ADS-equipped, the ODD is validated, FMCSA received the required notice, the system meets every technical condition and the operation does not involve excluded endorsements. Maintenance, incident response and annual reporting should be documented before dispatch. Noncovered trucks should retain their compliant emergency-warning equipment and procedures.
Primary-source note
This report is based on FMCSA's October 9, 2026 Federal Register notice, 91 FR 64736, docket FMCSA-2026-0958. The effective and expiration dates, scope, prior-notice requirement, ODD limitation, endorsement exclusions, technical conditions, comment count and reported waiver experience come from the agency's final disposition. CDL Truck Pro has not treated the exemption as a general authorization for autonomous-truck deployment or as a change to the warning-device rules for ordinary CMVs.
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Official sources
Federal Register: FMCSA final exemption decision, October 9, 2026FMCSA summary: Aurora warning-device exemption49 CFR 392.22: Emergency signals for stopped CMVs49 CFR 393.95: Emergency equipmentCDL Truck Pro provides educational information. Confirm licensing, safety, tax, and regulatory requirements through current official sources and qualified professionals.