设计一个十字路口交通信号灯，基本配置包括四个方向共组（红灯，黄灯，绿灯）‘还可以包括转弯灯（适用于单向三股以上车道），行人过马路信号灯（红灯，绿灯）。(Design a traffic signal lamp at the crossroads. The basic configuration includes four directions: the red light, the yellow light and the green light. It can also include tur