为Verilog Hdl代码，实现交通灯系统每个路口每次绿灯维持的时间是40 秒,黄灯为5 秒 ,左转灯10秒，红灯60秒-Code for the Verilog Hdl, to achieve traffic light system to maintain each intersection green time for each 40 seconds, yellow for 5 seconds, turn left at light for 10 seconds, the red light 60 seconds