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城市里的车多人多,如果大家都争先恐后地抢占马路,一定会出事故的。因此,第一个“红绿灯”于1868年12月10日,在英国伦敦议会大厦前的马路上出现了。那时还没有电,使用的是一种煤气灯,安装在一根7米高的钢柱上,一面是红灯,一面是绿灯,可以转动。从此,车马行人看
Many people in the city car, if we all scrambling to seize the road, will be an accident. Therefore, the first “Traffic Light” appeared on the road in front of the London Parliament Building on December 10, 1868. There was no electricity at that time, and a gas lamp was used which was mounted on a 7-meter-tall steel column with a red light on one side and a green light on the other and was able to rotate. Since then, pedestrians to see