Cat's eye (road)
Retroreflective safety device used in road marking
Cat's eye (road)
A cat's eye, or road stud, is a retroreflective safety device used in road marking and was the first of a range of raised pavement markers. The cat's eye, when illuminated by the lights of an approaching car, becomes very visible as a marker.
Read on Wikipedia · Image ELIOT2000, Public domain
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