1. Because of this experiment is the traffic light control experiment, it must first understand the actual changes of traffic lights. Assuming a crossroads for east-west north-south orientation. Initial state 0 for the east-west red lights, red lights north and south. And then switch to state 1, the opening of the North-South green, something red. Over time to state 2, North-South green light flashing orange light will be activated several times to delay a few seconds, things are still red. Then state 3, the opening of something green, red lights north and south. Over time to a state of 4, things turn green light flashing orange light will be activated several times, delay a few seconds, the North and the South is still a red light. The last cycle to a state of 1.

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