第一个状态：主干道、支干道均亮红灯5S * *第二个状态：主干道亮绿灯30S、支干道亮红灯 * *第三个状态：主干道绿灯闪3次转亮黄灯、支干道亮红灯3S * *第四个状态：主干道亮红灯、支干道亮绿灯25S * *第五个状态：主干道亮红灯、支干道绿灯闪3次转亮黄灯3S * *返回到第二个状态-The first state: trunk, branch roads are red second 5S** state: a green light trunk 30S, branc

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