SIGN NO LEFT TURN SYBMOL 24x24 .100 ALUM B&R/W HI R3-1. This sign is the standard sign that prohibits the vehicle from turning left. Made from heavy-duty engineering grade aluminum, it features two 3/8-inch pre-drilled holes and is easy to assemble. In addition, its symbology is done in red and black colors over a reflective white (which guarantees visibility at night).