本程序在系统中利用单片机的定时器、IO接口、中断系统等资源，设计一个十字路口交通信号灯的控制模拟系统。该系统尽可能模仿真实的交通灯系统，同时进行一些智能化设计，包括紧急状态处理，高峰状态处理等(This program designs a traffic signal control simulation system at crossroads by using the timer, IO interface, interruption system and other resources in the system. The system can imitate the real traffic light system as much as possible, and carry out some intelligent design, including emergency state processing, peak state processing, etc.)