Traffic signal controller to the main road intersection with Bypass Road, requested a priority to ensure the smooth flow of trunk road. Therefore, usually in the "main road the green light, red light sticks Road" status, only the branch to walk through the trunk of vehicles Road Road, the only traffic lights will be cut to the "trunk road red light, green light sticks Road", once the branch is no other road vehicles through the intersection, traffic lights returned to the "main road the green light, red light sticks Road," the shape

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