#	Letters of Interpretation
1	03/02/2010 - 1926.601(b)(4) - Permissible methods of operating trucks in reverse on construction sites.
2	09/27/2004 - 1926.601(b)(4)(ii) - Alternatives to common back-up alarms on construction motor vehicles; use of other effective technology or observers/signal persons.
3	09/27/2004 - 1926.601(b)(4)(i) - Alternatives to common back-up alarms on construction motor vehicles; use of other effective technology or observers/signal persons.
4	09/27/2004 - 1926.601(b)(4), 1926.601(b)(4)(i), 1926.601(b)(4)(ii) - Alternatives to common back-up alarms on construction motor vehicles; use of other effective technology or observers/signal persons.
5	05/27/2004 - 1926.601(b)(4)(ii) - Equipment reverse signal alarms must be audible above surrounding noise level.
6	05/27/2004 - 1926.601(b)(4)(i) - Equipment reverse signal alarms must be audible above surrounding noise level.
7	05/27/2004 - 1926.601(b)(4), 1926.601(b)(4)(i), 1926.601(b)(4)(ii) - Equipment reverse signal alarms must be audible above surrounding noise level.
8	11/03/1998 - 1926.601(b)(4) - Requirements for back-up alarms on construction vehicles.
9	07/12/1993 - 1926.601(b)(4)(i) - Reverse signal alarms for motor vehicles.
10	10/29/1991 - 1926.601(b)(4) - Noise and potential hazard of backup alarms on equipment at construction sites.
11	06/25/1982 - 1926.601(b)(4) - Requirements for back up alarms.
12	07/11/1980 - 1926.601(b)(4) - Regulations for back-up alarms.

#	Regulations
1	03/14/2001 - - Motor vehicles.