05/15/1972 — Marking and width requirements for aisles in industrial operations View PDF of complete letter
May 15, 1972
REPLY TO ATTN OF: OSHA/ARAC
SUBJECT: Compliance with Aisle Markings (Part 1910.22(b))
TO: All Area Directors
As a result of numerous calls regarding the marking and widths of aisles
in industrial operations, the following are considered to comply with
the requirements:
The lines used to delineate the aisles may be any color so long as they
clearly define the area considered as aisle space. The lines may be
composed of dots, square, strip or continuous, but they too must define
the aisle area.
The recommended width of aisle markings varies from 2 inches to 6
inches; therefore, any width 2 inches or more is considered acceptable.
The recommended width of aisles is at least 3 feet wider than the
largest equipment to be utilized, or a minimum of 4 feet.
R.A. Wendell
Assistant Regional Administrator for Compliance