Introduction - If you have any usage issues, please Google them yourself
Design a simple and automatic traffic light control system. The specific requirements in the two direction of the road crossroads, each with a set of red and green indicator light, display order, one direction is green, yellow light, red light, the other direction is a red light, green light, yellow light; set up a group of digital tube, with a countdown display allows or prohibited by the the duration of time, green light, yellow light, red light was 80s/6s/40s.