2013 California Standards for Accessible Design Pocket Guide

11B-403.5.2 Clear width at turn.

Where the accessible route makes a 180 degree turn around an element which is less than 48 inches (1219 mm)  wide, clear width shall be 42 inches (1067 mm)  minimum approaching the turn, 48 inches (1219 mm)  minimum at the turn and 42 inches (1067 mm)  minimum leaving the turn.

Exception: Where the clear width at the turn is 60 inches (1524 mm) minimum compliance with Section 11B-403.5.2 shall not be required.

FIGURE 11B-403.5.2

CLEAR WIDTH AT TURN