Solar or electric road studs are devices used to improve visibility and increase safety on roads, especially during low-light conditions or bad weather. They are typically made of durable materials such as plastic or aluminum and are embedded in the road surface. Solar road studs are powered by solar panels that charge during the day and illuminate at night, while electric road studs are powered by batteries, and both are designed to mark the edges of the road to create barriers or guide traffic on highways, intersections, and other areas where visibility is limited.