Description: This control system for traffic lights at a crossroads, and North-South Road at East-West Road, located east-west Road for A Road, B Road, North-South Road. Requirements: First of all, what the red light at the junction, north-south road junctions green, at the same time the beginning of 25s countdown to 7 digital tube display time. 25s countdown 5s after the end of the beginning of the countdown, the green light flashes at the junction of the North and the South, a time to the last 2s, the north-south road junctions yellow light. Complete 1st cycle of the need for such 30s. 30s after the end of the red light at the junction north-south, east-west road junctions green and re-30s countdown, followed by the cycle. If so called for the adoption of emergency vehicles, this system should be able to prohibit ordinary vehicles, and let emergency vehicles through.
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