Heavy duty IP68 waterproof 80t embedded solar led road stud. $12.00 - $13.50 / Piece. 1 Piece (Min. Order) Add to Favorites. Yellow Solar Road Stud For Motorway Factory--Solar Road Studs . We use solar road studs to mark the edges and centerline of lanes. Solar road studs can be used to provide direction on one-way illuminated roads.