Equipment reverse signal alarms must be audible above surrounding noise level.

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 https://www.osha.gov.

May 27, 2004

Mr. Richard Holmes
Safety Department Manager
Aggregate Industries
1707 Cole Boulevard, Suite 100
Golden, Colorado 80401

Dear Mr. Holmes:

This is in response to your March 16, 2004, letter to the Occupational Safety and Health Administration's (OSHA) Englewood Area Office regarding the use of a reverse alarm, which is being manufactured in the United Kingdom, on construction sites. The alarm uses "white noise" instead of the more common single-tone alarm.

Alternatives to common back-up alarms on construction motor vehicles; use of other effective technology or observers/signal persons.

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 https://www.osha.gov.

September 27, 2004

[Name and address withheld]

Re: §§1926.601(b)(4) and 1926.602(a)(9)

Dear [Name withheld]:

Thank you for your letter of April 30, 2004, regarding noise emanating from excavating equipment and the Occupational Safety and Health Administration (OSHA) requirements for back-up alarms on construction equipment. We apologize for the delay in responding.

We have paraphrased your question as follows: