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Reading the regulations as they stood on June 1, 2010. Current text may differ.Switch to current
Current textIn force on June 1, 2010Source: annual CFR editions 2005–2016

§ 393.9 Lamps operable, prohibition of obstructions of lamps and reflectors.

Current wording, in the annual edition revised as of Oct. 1, 2005.

govinfo, 2009 edition ↗
Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 2009 edition's wording. An amendment that took effect between Oct. 1, 2009 and June 1, 2010 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates.
49 CFR § 393.9 — Lamps operable, prohibition of obstructions of lamps and reflectors.. Text in force on June 1, 2010. This wording effective October 1, 2005 to present. Source: govinfo, 2009 edition, https://www.govinfo.gov/app/details/CFR-2009-title49-vol5/CFR-2009-title49-vol5-sec393-9. Retrieved from FMCSR.com, https://fmcsr.com/reg/393.9?asof=2010-06-01, on October 26, 2026. Unofficial compilation; verify against the official source.

(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]

Amendment history

2 distinct wordings on file since Oct. 1, 1996
  1. Oct. 1, 2005 → presentannual editions 2005–2016diff vs. previousviewing
    [70 FR 48027, Aug. 15, 2005]
  2. Oct. 1, 1996 → Oct. 1, 2005annual editions 1996–2004
    [47 FR 47837, Oct. 28, 1982]

A new entry appears whenever the regulatory words change between government snapshots. Day-precise from the eCFR (2017 onward); before that, one snapshot per annual CFR edition (revised as of October 1). Bracketed citations are the Federal Register history printed with the section.