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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.
Robert Peyton, Director
Safety and Health Services
The Associate General Contractors of America
1957 E. Street, N.W.
Washington, D.C. 20006
Dear Mr. Peyton:
This is in response to your letter of August 24, regarding the problems associated with the definition, application and use of the term "Horns" as used in 29 CFR 1926.602(a)(9)(i).
Our response to your questions is as follows:
1. What is the definition of a "Horn" as used in 29 CFR 1926.602(a)(9)(i)?
A device sounded to provide a warning to employees exposed to the movement of the machine and the work being performed by the operator of the equipment.
2. What is the difference between the term "Horn" and audible alarm?
The audible alarm will give an audible signal suitable for the job conditions. The audible signal will provide the alarm during the entire time of backward movement, the horn is only to be sounded as necessary.
3. If a Bulldozer is equipped with a Bi Directional alarm is a horn required?
If a Bulldozer is equipped with a Bi Directional alarm 29 CFR 1926.602(a)(9)(i) which requires the horn is still enforced.
4. If a signal man is used to direct equipment in forward motion is a "Horn" required?
If a signal man is used to direct equipment in forward motion 29 CFR 1926.602(a)(9)(i) which requires the horn is still enforced.
If we can be of further assistance, please let us know.
Thomas J. Shepich, Director
Directorate of Compliance Programs