2013 California Standards for Accessible Design Pocket Guide

11B-406.5.1 Location.

Curb ramps and the flared sides of curb ramps shall be located so that they do not project into vehicular traffic lanes, parking spaces, or parking access aisles. Curb ramps at marked crossings shall be wholly contained within the markings, excluding any flared sides.

Exception:  Diagonal curb ramps shall comply with Section 11B-406.5.9.