§FMCSR.com
Historical textIn force on Oct. 1, 1997Source: annual CFR edition 1996

§ 392.15 Required and prohibited use of turn signals.

Wording first on file in the 1996 annual edition, superseded by the 1998 annual edition.

govinfo, 1996 edition ↗
Before Jan. 1, 2017 the record is one snapshot per annual CFR edition, revised as of October 1. This is the 1996 edition's wording. An amendment that took effect between Oct. 1, 1997 and Oct. 1, 1997 would not appear until the next edition, so check the citations below and the Federal Register for exact effective dates. govinfo does not publish the 1997 edition of Parts 300–399 in machine-readable form, so the 1996 text is shown for that year.
49 CFR § 392.15 — Required and prohibited use of turn signals.. Text in force on October 1, 1997. This wording effective October 1, 1996 to October 1, 1998. Source: govinfo, 1996 edition, https://www.govinfo.gov/app/details/CFR-1996-title49-vol4/CFR-1996-title49-vol4-sec392-15. Retrieved from FMCSR.com, https://fmcsr.com/reg/392.15?asof=1997-10-01, on October 26, 2026. Unofficial compilation; verify against the official source.

(a) Turns. Every commercial motor vehicle turn shall be signaled for a distance of not less than 100 feet in advance of, and during, the turning movement by flashing the turn signals at the front and the rear of the commercial motor vehicle on the side toward which the turning movement is made.

(b) Entry into traffic stream. Turn signals shall be flashed to indicate the direction of commercial motor vehicle movement, prior to and during entry of the commercial motor vehicle into the traffic stream from a parked position.

(c) Lane changes. Turn signals shall be flashed to indicate the direction of commercial motor vehicle movement continuously, for a distance of not less than 100 feet in advance of, and during, the turning movement of the commercial motor vehicle from one traffic lane to another.

(d) Parking or disablement. Turn signals shall not be flashed on one side only on parked or disabled commercial motor vehicles.

(e) Courtesy or “do pass” signals. Turn signals shall not be used as courtesy or “do pass” signals to operators of motor vehicles approaching from the rear.

[33 FR 19732, Dec. 25, 1968, as amended at 60 FR 38747, July 28, 1995]

Amendment history

4 distinct wordings on file since Oct. 1, 1996
  1. Nov. 8, 2021 → presenteCFR, day-precisediff vs. previous
    [86 FR 55743, Oct. 7, 2021]
  2. Oct. 7, 2021 → Nov. 8, 2021eCFR, day-precisediff vs. previous
  3. Oct. 1, 1998 → Oct. 7, 2021annual editions 1998–2016diff vs. previous
  4. Oct. 1, 1996 → Oct. 1, 1998annual edition 1996viewing
    [33 FR 19732, Dec. 25, 1968, as amended at 60 FR 38747, July 28, 1995]

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.