Its a code for controlling traffic lights.

交通灯，红黄绿三色循环，可以设置持续时间-Traffic lights, red green and yellow three-color cycle, you can set the duration

基于单片机的交通信号灯的简单控制系统，方法简便。利于初期学习单片机使用掌握io口的使用-Simple microcontroller-based traffic lights control system, the method is simple. Conducive to early learning microcontroller to use to master the use of io I