Watch: Cab-mounted beacons vs. triangles — five-year exemption granted, and what fleets should track

Oct 5

Watch: no commercial relationship

Pilot / regulatory Watch · Zorro Risk Management · zorrorisk.com

Update, Oct. 8, 2026: FMCSA has granted the five-year exemption on docket FMCSA-2026-0958, letting Aurora and other carriers running Level 4 automated trucks that notify FMCSA in writing first use cab-mounted beacons instead of warning triangles. The exemption "is effective October 7, 2026 and expires October 7, 2031," and it has not yet appeared in the Federal Register. FMCSA's July 9 waiver terms confirm the current waiver runs through 11:59 p.m. on Oct. 9, 2026; we found no reissued waiver, and whether FMCSA will reissue or end it now that the exemption exists is unknown. On Oct. 5, the Seventh Circuit denied a motion to stay the waiver (No. 26-2838), and the case remains open.

What this Watch covers

Level 4 driverless trucks cannot send a person onto the shoulder to place reflective triangles. Developers asked FMCSA to allow cab-mounted warning beacons instead. FMCSA has handled that request on two tracks: short-term waivers, and a five-year exemption that it granted on Oct. 7, 2026. This piece reports what is on the public record — not a product recommendation.

Illustrative diagram of a generic stopped semi-truck comparing two ways to warn traffic: reflective warning triangles that a driver places behind the trailer, which human-driven trucks still use, and a cab-mounted amber beacon, allowed instead of triangles under a five-year FMCSA exemption (Oct. 7, 2026 to Oct. 7, 2031) for Level 4 automated trucks whose carriers notify FMCSA first. Not to scale.

The five-year exemption (Docket FMCSA-2026-0958): granted Oct. 7, 2026

On April 15, 2026, FMCSA published Aurora Operations, Inc.’s application for a five-year exemption so Level 4 ADS-equipped CMVs could use cab-mounted amber beacons in lieu of placing the warning devices required by the FMCSRs. The notice covers exemptions from:

49 CFR 392.22(b) (placement of warning devices),
49 CFR 393.25(e) (steady-burning exterior lamps), and
49 CFR 393.95(f) (types/number of warning devices).

Comments closed May 15, 2026. On Oct. 7, 2026, FMCSA granted the application. Its notice of final disposition grants “a limited five-year exemption to Aurora Operations, Inc. (Aurora) and other motor carriers operating Level 4 automated driving system (ADS)-equipped commercial motor vehicles (CMVs), with prior notice to FMCSA,” from all three requirements above. In FMCSA’s words: “The exemption is effective October 7, 2026 and expires October 7, 2031.”

Key conditions in the grant:

Notice first. Carriers other than Aurora “must notify FMCSA in writing prior to commencing operations covered by this exemption.”
Beacon timing. Beacons must activate “as soon as possible, but in any event within five minutes.”
Where. Only on roadways inside each truck’s validated operational design domain (ODD).
What. No hazardous materials and no passengers.
Reporting. Any crash while the beacons are activated, or should have been, must be reported to FMCSA within 5 calendar days, plus an annual report by Nov. 1.
Revocable. FMCSA can revoke the exemption if it “results in a lower level of safety than was maintained before it was granted,” or for noncompliance.

FMCSA reports receiving 402 comments on the application. As of Oct. 8, 2026, the decision has not yet been published in the Federal Register; the grant itself says FMCSA must publish it there. Until it is, the FMCSA page below is the primary source.

Primary sources: FMCSA — Grant of Application for Exemption From Aurora Operations, Inc. (Oct. 7, 2026) · Federal Register application notice (91 FR 20252) — docket FMCSA-2026-0958.

In the April notice, FMCSA summarized that Aurora reported 109 Class 8 trucks and expected more than 200 Level 4 trucks by end of calendar 2026, and that Kodiak Robotics had notified FMCSA it was also operating under the then-current limited waiver. The notice said the limited waiver in force at publication would expire July 9, 2026.

The short-term waiver track — Oct. 9, 2026 end date confirmed

FMCSA has issued a series of roughly three-month waivers allowing covered Level 4 operations to use cab-mounted beacons instead of roadside triangles/fusees, subject to terms (activation timing, crash reporting, term reports, opt-in notification).

Current waiver ends 11:59 p.m. Oct. 9, 2026 (confirmed by FMCSA): FMCSA’s July 9, 2026 waiver terms state that the waiver “is approved for the three-month period from 12:00 a.m. on July 10, 2026, through 11:59 p.m. on October 9, 2026,” and that it “will be reissued” absent a violation of its terms, a carrier safety notification, or an FMCSA safety-deficiency finding. As of Oct. 8, 2026, we found no FMCSA reissue letter or terms for a window starting Oct. 10. The Oct. 7 exemption grant does not say whether it replaces or ends the waiver. Whether FMCSA reissues the waiver after Oct. 9 or lets it end now that the exemption exists is unknown, as is whether opt-in notices filed under the waiver carry over to the exemption.

FMCSA: Waiver of Warning Device Requirements Terms and Conditions (July 9, 2026)
Prior official waiver window (April 10–July 9, 2026): FMCSA's April 8, 2026 waiver letter; the Federal Register notice (91 FR 20252) notes that waiver would expire July 9, 2026.
Secondary background (Oct. 2, 2026; its report that the court had not ruled is now out of date): FreightWaves — Autonomous truck beacon waiver moves closer to October renewal amid legal challenge

Court challenge: stay denied, case still open. A petition for review filed Sept. 8, 2026, Kostas Giannoulias v. FMCSA (7th Cir. No. 26-2838), challenges the July waiver and asked the court to stay it. On Oct. 5, 2026, the court ruled: “The motion for a stay and to expedite the appeal is DENIED.” The case remains open, with the agency record or certified list due Oct. 19, 2026. Trade reports from Oct. 2 and Oct. 3 saying the court had not ruled are out of date. FMCSA told the court that three companies besides Aurora — Kodiak Robotics, Waabi Logistics, and Stack AV — “have availed themselves of the waiver,” and that Waabi and Stack AV had not deployed driverless trucks as of July 31, 2026. As of Oct. 8, we had not found a court challenge to the Oct. 7 exemption itself; public court-record coverage is incomplete.

Court docket: Kostas Giannoulias v. FMCSA, 7th Cir. No. 26-2838 (CourtListener)

FMCSA ADS rulemaking status (one paragraph)

Separately from beacons, FMCSA’s broader rulemaking on ADS-equipped CMVs (RIN 2126-AC17) remains at the Proposed Rule Stage on the Unified Agenda. The last major published action on that docket was the February 2023 supplemental ANPRM; the 2026 agenda lists an NPRM target of 08/00/2026. As of our Oct. 8, 2026 check, no NPRM under RIN 2126-AC17 had been published in the Federal Register.

Unified Agenda: RIN 2126-AC17 (pubId 202510)
SANPRM: Safe Integration of ADS-Equipped CMVs (Feb. 1, 2023)

California DMV heavy-AV rules (one paragraph)

On April 28, 2026, California DMV announced adoption of updated AV regulations that remove the prohibition on AVs with GVWR of 10,001 lb or more, opening a path to test and deploy heavy-duty AV freight under permits. Manufacturers must progress from safety-driver testing to driverless testing before commercial deployment; heavy-duty testing requires 500,000 miles per phase plus a structured safety case. Heavy-duty AVs must still stop at CHP weigh stations and meet applicable state and federal CMV rules.

Source: California DMV — New Autonomous Vehicle Regulations (April 28, 2026).

What this means for fleet safety managers

This is not for-sale ADAS. There is now a durable five-year exemption (Oct. 7, 2026 to Oct. 7, 2031), but it covers only Level 4 ADS-equipped trucks run by Aurora and other carriers that notify FMCSA in writing first, inside each truck’s validated operating area, with no hazmat or passengers. It is not a retrofit kit you order for a conventional fleet, and it does nothing for human-driven trucks. Do not budget “beacon exemption” as a compliance product.
Watch the dates. The exemption runs to Oct. 7, 2031 unless FMCSA revokes it; the current waiver window ends 11:59 p.m. Oct. 9, 2026, and what follows it is unknown. If your network shares roads with driverless pilots (Texas corridors are the usual example in public materials), a stopped Level 4 truck operating under the exemption may show a cab-mounted amber beacon instead of triangles. Prefer FMCSA pages and the Federal Register over secondary blogs when the clock matters.
Keep triangle / fusee discipline for human-driven CMVs. Standard 392.22 / 393.95 duties still apply to your drivers unless you are lawfully operating under a stated waiver/exemption. In the grant, FMCSA wrote that updating warning-device requirements “for all CMVs, not just ADS-equipped CMVs, may be ripe for future regulatory action” — a statement, not a proposed rule.
Track four items: (a) whether FMCSA reissues or ends the waiver after Oct. 9, (b) Federal Register publication of the exemption and any challenge to it, (c) the open 7th Circuit case (No. 26-2838), and (d) CA DMV heavy-AV permitting if you run or partner in California.
No buy decision from this page. When a product is sold to fleets with clear terms, it may move from Watch to independent review. Until then: sources only, no ratings, no affiliate links.

Watch — no commercial relationship.

Stay ahead of the next compliance change.

FMCSA revocations, roadside OOS risk, driver health, and the AV rules that change what you see on the highway — summarized once a week for people who run trucks, not press releases. The Weekly Beacon is free.

Zorro Risk Management