www.roadstudlight.com › roadstudRoad Studs, Solar Road Stud, Raised Pavement Marker Road Studs. The road stud, which is also called raised pavement marker, we refer here is mainly used in highways, and it is a traffic safety facility. the road stud is mainly installed between the road lines or double yellow lines, and it can warn the drivers to drive on their right way by its retro-reflection.°