Standard Interpretations - Table of Contents
• Standard Number: 1926.601; 1926.601(b)(4); 1926.602(a)(9)(ii)

OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at

March 2, 2010

Letter to 20090429-9037

Re: Permissible methods of operating trucks in reverse on construction sites.

Question #1: Does 29 CFR 1926 Subpart O permit an employer to use a rear-mount day/night camera system with in-cab monitoring of the truck's rear instead of a back-up alarm?

Answer #1: Two requirements in 29 CFR 1926 Subpart O, 1926.601(b)(4) and 1926.602(a)(9), relate to back-up alarms, on trucks in construction, both of which are triggered when the operator's view is obstructed:1

Section 1926.601(b)(4) states:

§1926.601 Motor vehicles.
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(b) General requirements,
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(4) No employer shall use any motor vehicle equipment having an obstructed view to the rear unless:
(i) 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 i