因为红色光在空气中传得最远。红色停车灯使司机能在远处看清信号,减速慢行,防止发生交通事故。在城市的高楼大厦(shà)顶上常常装有红灯。这些红灯可以提示夜航的飞行员,从而保证飞行安全,防止撞(zhuàng)机事故发生。为什么停车灯和警示信号灯要用红色?@波波 Because the red light spread the farthest in the air. Red parking lights enable drivers to see the signal in the distance, slow down to prevent traffic accidents. In the city's high-rise buildings are often filled with red lights at the top. These red lights can alert night pilots, thus ensuring flight safety, to prevent the collision occurred. Why stop lights and warning lights to use red? @ Bobo