2013 California Standards for Accessible Design Pocket Guide

11B-810.6.2 Routes and destinations.

Lists of stations, routes and destinations served by the station which are located on boarding areas, platforms, or mezzanines shall comply with Section 11B-703.5 _|Signs; Visual Characters|_. At least one tactile sign identifying the specific station and complying with Section 11B-703.2 _|Signs; Raised Characters|_ shall be provided on each platform or boarding area. Signs covered by this requirement shall, to the maximum extent practicable, be placed in uniform locations within the system.

Exception:  Where sign space is limited, characters shall not be required to exceed 3 inches (76 mm).