Traffic lights. 1) When there are no vehicles on the rural road, the rural road light should always be red and the main road light should be green. (2) When there are vehicles on the rural road and the main road has exceeded its minimum traffic time, the main road should be closed to traffic and the rural road should be allowed to pass. The minimum traffic time of the main road is 25 seconds. (3) When there are vehicles on both the rural road and the main road, the main road should be open for 25 seconds and the rural road should be open for 16 seconds. 4) Regardless of the situation on the main road, the maximum traffic time of the rural road is 16 seconds. (5) In the process of each transition from green to red, a yellow light should be turned on for 5 seconds as a transition. (6) Use a switch instead of a sensor as a signal to detect whether a vehicle is coming. Use red, green and yellow LEDs as traffic lights.
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