According to the 2010 ADA Standards for Accessible Design, the minimum clear width for an accessible route, which includes aisles in retail spaces, is 36 inches (914 mm). This dimension is the standard minimum required to allow passage for a person using a wheelchair. While other dimensions are specified for different conditions (e.g., doorways, turns, passing spaces), the fundamental minimum width for a continuous walking surface or circulation path is 36 inches. This ensures a basic level of maneuverability and access throughout the public areas of a facility.

A. 32" [813 mm]: This is the minimum clear width required for a doorway opening, not the continuous width of an accessible route or aisle.

C. 42" [1067 mm]: This width is required for specific conditions, such as making a 180-degree turn around an obstruction, but it is not the general minimum aisle width.

D. 48" [1219 mm]: This dimension is related to specific clearances, such as the width required for two wheelchairs to pass or the approach to a turn, not the absolute minimum for a single-direction aisle.

1. U.S. Department of Justice. (2010). 2010 ADA Standards for Accessible Design. Section 403.5.1 Clear Width. "Except as provided in 403.5.2 and 403.5.3

the clear width of walking surfaces shall be 36 inches (915 mm) minimum."

2. International Code Council. (2017). ICC A117.1-2017 Accessible and Usable Buildings and Facilities. Section 403.5.1 Clear Width. This standard

which is harmonized with the ADA

also specifies: "the clear width of walking surfaces shall be 36 inches (914 mm) minimum."

3. Steinfeld

E.

& Maisel

J. L. (2012). Universal Design: Creating Inclusive Environments. John Wiley & Sons. Chapter 10: Circulation. The text discusses accessible circulation paths

referencing the ADA standard of 36 inches as the minimum clear width for routes. (Specific reference to ADA guidelines within the chapter).