功能一：可以实现红绿灯的转换以及控制路口的基本功能。

功能二：有倒计时功能和最后十秒绿灯闪烁的功能。

功能三：出现紧急情况时，可以警察手动控制特殊状态，并维持交通。

功能四：119或120等特种车经过时，可转换成为特种车道行驶状态，并在情况消除后15秒，恢复原状。-A: you can realize the basic function of traffic light switches and control intersection.

Function 2: a countdown function and the function of the last ten seconds a green light flashing.

Features three: there s an emergency, can be manually controlled police special status, and maintain the traffic.

Four features: the special car after such as 119 or 120, can be converted into special lane state, and in eliminating after 15 seconds, restorable.