求翻译：　　　在车辆通行繁忙的十字交叉路口设置的交通灯控制系统，其特点是：道路较窄而车流量较大，主干道，支干道的车辆通行时间不等，，同时设有道路应急控制。具体的情况是：在正常的情况下，东西支干道通行时间为20秒，南北主干道通行时间为30秒，每个方向在绿灯转为红灯时，要求黄灯先亮5秒钟，才能变换运行车道。并且能够在人工监控状态下，如果一道有车而另一道无车，交通灯控制系统能立即让有车道放行。而且有紧急车辆要求通过时，系统要能禁止普通车辆通行。是什么意思？

Cross the intersection set of traffic lights in busy vehicle traffic control system, which is characterized by: the road narrow but the traffic of larger, main road, roads vehicle traffic ranging, while a road for emergency control. Specific: in normal circumstances, what branch roads passage time o

In busy traffic intersection of the 10 cross-set of the traffic light control system, it is characterized by a relatively narrow roads and vehicular traffic is large, the backbone of the trunk road, support vehicles, ranging from time travel, there are also road emergency control. It is a situation-

Passes through the busy cross four corners establishment traffic light control system in the vehicles, its characteristic is: But the path is narrow the traffic flow magnitude to be big, the main yang or male principle, the yang or male principle vehicles general time different, simultaneously is eq

In cross intersections with heavy traffic set of traffic light control system, which is characterized by: the road is narrow and traffic flow is large, main road, main road traffic ranging from time and, at the same time a road emergency control. Specific case: in normal circumstances, road traffic

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