Non-Reflective Plastic Pavement Markers Type 929A. 4” round. Colors: yellow or white. Barricade Light Type A/C (two-sided visibility), D-cell, 3-volt, 3-way operation. Steady On, Flashing, or OFF. Only operates at night and automatically turns off during daytime to extend battery life. Meets ITE specs and is NCHRP-350 approved.