If an accessible route has less than 60 inches (60" = 1524mm) clear width, then passing spaces at least 60 inches by 60 inches (60" x 60" = 1524mm by 1524mm) shall be located at intervals not to exceed 200 feet (200' = 61m). A T-intersection of two corridors or walks is an acceptable passing place.
521 CMR, § 20.5