Introduction - If you have any usage issues, please Google them yourself
1, based on single-chip STC89C51
2, the digital countdown display time.
3, each of the two north-south direction and things digital, show time, and the north and south of the time things are not the same, oh, a difference of yellow time is correct.
4, can set the access roads and branch roads in time.
5, there is an emergency mode, special vehicles priority traffic accidents or emergency treatment.