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Reading the regulations as they stood on October 1, 2007. Current text may differ.Switch to current
Current textIn force on Oct. 1, 2007Source: annual CFR editions 2005–2016

§ 393.61 Truck and truck tractor window construction.

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

govinfo, 2007 edition ↗
Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 2007 edition's wording. An amendment that took effect between Oct. 1, 2007 and Oct. 1, 2007 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates.
49 CFR § 393.61 — Truck and truck tractor window construction.. Text in force on October 1, 2007. This wording effective October 1, 2005 to present. Source: govinfo, 2007 edition, https://www.govinfo.gov/app/details/CFR-2007-title49-vol5/CFR-2007-title49-vol5-sec393-61. Retrieved from FMCSR.com, https://fmcsr.com/reg/393.61?asof=2007-10-01, on October 26, 2026. Unofficial compilation; verify against the official source.

Each truck and truck tractor (except trucks engaged in armored car service) shall have at least one window on each side of the driver's compartment. Each window must have a minimum area of 1,290 cm 2 (200 in 2) formed by a rectangle 33 cm by 45 cm (13 inches by 17 3/4 inches). The maximum radius of the corner arcs shall not exceed 152 mm (6 inches). The long axis of the rectangle shall not make an angle of more than 45 degrees with the surface on which the unladen vehicle stands. If the cab is designed with a folding door or doors or with clear openings where doors or windows are customarily located, no windows shall be required in those locations.

[70 FR 48052, 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 48052, Aug. 15, 2005]
  2. Oct. 1, 1996 → Oct. 1, 2005annual editions 1996–2004
    [33 FR 19735, Dec. 25, 1968, as amended at 37 FR 11677, June 10, 1972]

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.