Description: The controller can realize the simulation control of traffic signals under normal conditions of the city "cross" and the special situation and emergency situations.
1. Red, yellow and green lights are set in north and south at the crossroads, as shown in figure 1. Normally, things, north and south will take turns. When the direction (A line) is released, the north and south (B) line is forbidden, the green light of the direction (A line) is 25 seconds, then the yellow light is 5 seconds, the north and south (B) red light is 30 seconds. When the north and south (B lines) are released and things are banned, the north and south (B) lights are green for 25 seconds, then yellow lights are on for 5 seconds, and the direction (A) is red for 30 seconds. This cycle, to achieve the traffic light timing control.
2. First-aid car is preferred through function. When the first aid arrives, the traffic lights at the intersection all change red light, so that the emergency car can pass, the time of the emergency car is 10 seconds, after the ambulance, the traffic light is restored to its previous state.
3. The traffic lights are lit alternately in red and green, and two digital tubes show that the lighted lamp can last longer.
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