C.F.R. » Title 49 » CHAPTER III—FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › SUBCHAPTER B—FEDERAL MOTOR CARRIER SAFETY REGULATIONS › PART 393—PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION › Subpart B—Lamps, Reflective Devices, and Electrical Wiring

49 C.F.R. § 393.9

Lamps operable, prohibition of obstructions of lamps and reflectors

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(a) All lamps required by this subpart shall be capable of being operated at all times. This paragraph shall not be construed to require that any auxiliary or additional lamp be capable of operating at all times.

(b) Lamps and reflective devices/material required by this subpart must not be obscured by the tailboard, or by any part of the load, or its covering by dirt, or other added vehicle or work equipment, or otherwise. Exception: The conspicuity treatments on the front end protection devices may be obscured by part of the load being transported.

[70 FR 48027, Aug. 15, 2005]
Notes of Decisions
Cited in 3 cases (2 in the last 5 years), 2014–2025 · leading case: D Est. of William Howard McDuffie-connor v. Scott M Neal (Mich. Ct. App. 2024).
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D Est. of William Howard McDuffie-connor v. Scott M Neal (Mich. Ct. App. 2024). “For example, it identified each of the “inoperative turn signal[s]” as a violation of 49 CFR 393.9 (“393.9TS-Inoperative turn signal .”
Mark Christiansen v. Kevin Armbrustmacher (Mich. Ct. App. 2025). “Wallace 1 We agree, however, with the trial court’s conclusion that the federal regulations concerning lights on commercial vehicles did not mandate that the hi-lo’s lights “be capable of operating at all times,” 49 CFR 393.”
Torres v. DeMatteo Salvage Co., 34 F. Supp. 3d 286 (E.D.N.Y 2014). “On February 12, 2013, the Plaintiff filed an administrative complaint with the Department of Transportation (“DOT”), alleging that he was fired based on his refusal to operate vehicles that were unsafe or in violation of DOT regulations, codified in the 49 C.F.R. 393.9, 393.28,…”
— 49 C.F.R. § 393.9(a) — 1 case
Mark Christiansen v. Kevin Armbrustmacher (Mich. Ct. App. 2025). “Wallace 1 We agree, however, with the trial court’s conclusion that the federal regulations concerning lights on commercial vehicles did not mandate that the hi-lo’s lights “be capable of operating at all times,” 49 CFR 393.”
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