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Standard Interpretations - Table of Contents
• Standard Number: 1910.22(b)

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

May 15, 1972


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

[Corrected April 17, 2009]

Standard Interpretations - Table of Contents

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