Aitao Solar Power 6 LED Outdoor Road Driveway Pathway Dock Path Security Light They have been specifically designed with road safety in mind and can help to prevent serious accidents and emit rather than reflect light. As soon as it starts getting dark the LED lights in the stud come on automatically each night for up to 10 hours. Solar LED Road Studs are also known as solar raised pavement markers, solar reflective lane markers and solar warning devices. These solar LED road studs are naturally charged by the sun.