设计的交通灯应用在两条主干道的汇合点形成十字交叉路口，为确保车辆安全，迅速地通行，在交叉道口的每个入口设置了红，绿，黄三色信号灯。红灯亮禁止通行，绿灯亮允许通行，黄灯亮则警告行驶中的车辆，并让它们有时间停靠到禁行线之外。--Design used in traffic lights the confluence of two main roads cross the intersection form, in order to ensure their safe and prompt access, in the crossroads of each entrance of the red, green, and yellow lights. Closed to traffic red light, green light is allowed to pass, the yellow light warning moving vehicles, and allow them time to stop the entry lane outside.