2010 ADA Standards for Accessible Design Pocket Guide
Where provided, escalators shall comply with the sections 184.108.40.206.6 and 220.127.116.11.5 of ASME A17.1 (incorporated by reference, see “Referenced Standards” in Chapter 1) and shall have a clear width of 32 inches (815 mm) minimum. [S.H. 10.3.1(16)]
EXCEPTION: Existing escalators in key stations shall not be required to comply with 810.9.