The National Marker Company sign with the legend âSLOW - PEDESTRIAN CROSSINGâ is often seen near crosswalks. It alerts drivers to slow the vehicle for the safety of the pedestrians. The traffic control sign uses contrasting colors to ensure clear visibility from a distance and in most lighting conditions. The material used in the pedestrian crossing sign is UV resistant, chemical resistant, graffiti proof and has an NMC Sign Muscle coating that protects the graphic against fading, scratches, scuffing, mold, and moisture.