由于在早期的陆上交通工具都是些牛车、马车，速度慢，车辆少，所以，人车并行，相安无事。自进入19世纪，世界上出现了第一条铁路，并随着汽车时代的到来，人车同行的矛盾便突出起来，交通信号灯也便应运而生，它在指示车辆运行及维护城市交通秩序方面起着重要的作用。1868年? Because in the early land transport are some oxen, wagon, slow, less vehicles, so people and vehicles in parallel, no problem. Since entering the 19th century, the world’s first railroad has emerged. With the advent of the automobile era, the contradictions between people and vehicles have come to the fore. Traffic lights have come into being. They are indicative of vehicle operation and maintenance of urban traffic order It plays an important role. 1868?