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SESK: Stuff Everyone Should Know · sesk.info/osha-reverse-signal-alarm-observer

What is required when a construction vehicle has an obstructed rear view?

A reverse signal alarm or an observer is required.

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  1. Use wide-angle side mirrors
  2. Turn on the hazard lights
  3. Have a reverse signal alarm or an observer ✔

Why: 1926.601(b)(4) says a vehicle with an obstructed rear view needs a reverse alarm audible above the noise, or it may back up only when an observer signals it is safe.

Huh, didn't know that: The observer signals when it is safe to back up.

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Why did the backup alarm join the band? It had a strong reverse tone.
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References

Answer: Have a reverse signal alarm or an observer. 1926.601(b)(4) says a vehicle with an obstructed rear view needs a reverse alarm audible above the noise, or it may back up only when an observer signals it is safe.

  1. 29 CFR 1926.601(b)(4) www.law.cornell.edu/cfr/text/29/1926.601
    The vehicle has a reverse signal alarm audible above the surrounding noise level or: (ii) The vehicle is backed up only when an observer signals that it is safe
    Checked 2026-10-10.

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