ABS solar powered road stud expressway raised pavement marker Solar Road Stud (2,8 x 12,5 x 14,5 cm) – Delineator Studs / Solar Road Stud (2,8 x 12,5 x 14,5 cm) Solar Road Stud (2,8 x 12,5 x 14,5 cm) Road studs, also called raised pavement marker, Botts` dots, cat`s eyes, or road turtles are used for lane delineation, especially during the hours of darkness and adverse weather conditions.