红绿灯程序。红灯亮五秒后灭接着黄灯亮五秒，黄灯亮五秒后灭 绿灯亮五秒灭的同时，红灯亮五秒，依次循环-Traffic lights program. After five seconds the red light yellow light off and then five seconds, the yellow light green light off after five seconds off five seconds, while the red light five seconds,