noun
road mirror; traffic mirror
A convex mirror installed at blind corners, intersections, or narrow roads to improve visibility and prevent accidents.
交差点のロードミラーで対向車を確認した。
I checked for oncoming cars using the road mirror at the intersection.
Variant with interpunct; less common in everyday writing.
カーブミラー is a more common term for a convex mirror on a curve, while ロードミラー is a broader term for any road mirror, including those at intersections.
Loanword from English 'road mirror'.