automatic warning deviceの例文

例文

1. Testimony at the three-day hearing indicated the passenger train had gone through a red light, and an automatic warning device in the cab was not working.
2. More heavily trafficked crossings have " automatic warning devices " ( AWDs ), with alternately flashing red lights to warn automobile drivers and a bell to warn pedestrians.
3. As far as warning systems for road users are concerned, level crossings either have " passive " protection, in the form of various types of warning signs, or " active " protection, using automatic warning devices such as flashing lights, warning tones and boom gates.