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In order to show compliance to FMVSS 108, the lens of each original equipment and replacement headlamp, daytime running lamp (DRL) and certain conspicuity reflectors must be marked with the symbol "DOT". [1]: S6.5, S8.2.1.3, Table III This symbol may also be applied to compliant signal lighting devices, but is not mandatory.
Raised reflective markers, such as plastic, ceramic, or metal ones, include a lens or sheeting that enhances their visibility by retroreflecting automotive headlights, while glass road studs gather automotive headlights with a dome shape and reflect the lights with a reflective layer within.
A key feature of the cat's eye is the flexible rubber dome which is occasionally deformed by the passage of traffic. A fixed rubber wiper cleans the surface of the reflectors as they sink below the surface of the road [2] (the base tends to hold water after a shower of rain, making this process even more efficient). The rubber dome is protected ...
"Retroreflectors" (also called "reflex reflectors") produce no light of their own, but rather reflect incident light towards its source, such as another driver's headlights. They are regulated as automotive lighting devices, and specified to account for the separation between a vehicle's headlights and its driver's eyes.
In colder climates, reflective markers may be installed below ground using an elongated narrow triangle, cut into the road surface that allows the device to be installed below the road surface. Newer technology allows these to be placed above ground with snowplough-able rails that attempt to protect the reflective components from the snowplow ...
A round, white Botts' dot, surrounded by excess adhesive Botts' dots on Interstate 280, near the Sand Hill Road exit, Menlo Park, California. Botts' dots (turtles in Washington and Oregon or buttons in Texas and other southern states) are round non-reflective ceramic [1] raised pavement markers.