noun
convex traffic mirror; curve mirror
A convex mirror installed at blind curves or intersections to improve visibility for drivers and pedestrians.
wasei-eigo (Japanese-coined English), from curve mirror
見通しの悪い交差点にはカーブミラーが設置されている。
A convex traffic mirror is installed at intersections with poor visibility.
カーブミラーで後
I checked for cars coming from behind using the curve mirror.