Introduction - If you have any usage issues, please Google them yourself
Design of traffic signal control system.
1) all the way to delay 60S, all the way to delay 40S, when the demonstration to save time, all the way to delay 15S, all the way to delay 10S, two times were different digital display
2) When the countdown 3S, yellow flashing
3) Emergency access control, such as a certain direction is now red, buttons forcibly switched to green, and the other way to red for the delay of several seconds (10S), the restoration of the original state (red) to continue the countdown.