haulrecordFMCSA data

Violation codes / 393.9A-LTSIR

49 CFR 393 · Parts and accessories

393.9A-LTSIR

What it means

Lighting - Turn signal -Any inoperative on a unit that is not the rearmost unit

What the rule actually says

This violation cites 49 CFR 393.9, lamps operable, prohibition of obstructions of lamps and reflectors. The regulation reads:

(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.

49 CFR 393.9, Lamps operable, prohibition of obstructions of lamps and reflectors. Read the full section on eCFR

Quoted verbatim from the Electronic Code of Federal Regulations. Nothing here is a paraphrase, and nothing here is legal advice on a citation.

Times recorded30,1096% as often as 393.9, the most cited
How common109thof the 200 most cited codes, out of 2,372 that exist
Regulation393.9Parts and accessories

How often this comes up

This violation was recorded 30,109 times across the roadside inspections in the FMCSA file, making it the 109th most frequently cited code. Whether a given instance puts a vehicle or driver out of service is decided at the roadside by the inspector, not by the code itself, so the same violation can end a trip or simply be noted.

It sits under 49 CFR Part 393, which covers parts and accessories. To see it in context, look up a carrier and read its inspection history: the same code appearing repeatedly is a different signal from a single occurrence.

Look up a carrier's inspection record

Other parts and accessories violations

Counts are from the FMCSA Inspections and Violations file via data.transportation.gov. This describes how the violation is recorded, and is not legal advice on a citation.