予よ告こく灯とう

noun

advance warning light

A light that gives advance warning, used in contexts such as road hazards, trains, elevators, and similar safety or signaling systems.

• 踏ふみ切きりの予よ告こく灯とうが点てん滅めつし始はじめた。

  The advance warning light at the railroad crossing started flashing.

• エレベーターの予よ告こく灯とうが到とう着ちゃくを知しらせる。

  The elevator's advance warning light signals its arrival.