A raised pavement marker is a safety device used on roads. These devices are usually made with plastic, ceramic, or occasionally metal, and come in a variety of shapes and colors. Raised reflective markers include a lens or sheeting that enhances their visibility by reflecting automotive headlights. Some other names for specific types of raised pavement markers include Botts' dots, delineators, cat's eyes, road studs, or road turtles. Sometimes they are simply referred to as reflectors.
Read more about Raised Pavement Marker: Reflective Raised Pavement Markers, Cat's Eyes, Botts' Dots, Pedestrian Crossing Studs, Delineator
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