A retroreflector is a small optical device that sends incoming light back toward its source, making it highly visible at night.Unlike ordinary mirrors, it uses special prisms, beads, or lenses to return headlights toward drivers.These reflectors are commonly found on road signs, bicycle equipment, roadside posts, and poles to improve nighttime visibility.They can also serve as survey markers, although their exact purpose depends on where and how they are installed.. SEE BELOW
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