noun
road stud; raised pavement marker
Refers to reflective or non-reflective markers embedded in or affixed to road surfaces for lane delineation and traffic guidance.
夜間、道路鋲がヘッドライトを反射して車線を示す。
At night, road studs reflect headlights to indicate lanes.
Compound of 道路 (road) and 鋲 (rivet, stud). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.