R5 Series — Prohibited Movement and Parking Signs

The R5 Series covers regulatory signs that prohibit specific vehicle movements or restrict access. DO NOT ENTER (R5-1) and WRONG WAY (R5-1a) are the most critical signs in this series for California work zones. They are used wherever a closed ramp, one-way lane, or wrong-way entry hazard exists — protecting drivers who might otherwise enter a work zone in the wrong direction.