Some intersections have separate traffic lights for left-turningtraffic and for traffic going through the intersection or turning right.
一些十字路口有分离的专用交通灯来指示转左或转右，或直行通过。
2
Then, it investigates the most effective evaluation index of left-turningtraffic forbiddance system, discusses of two cases a section of a road and an intersection, separately.
然后，提出了禁左交通效果评价的主要指标，分别考虑路段和交叉口两种情况。
3
At the same time, traffic control on turningleft must match with distribution of roads net. Try best not to cause great inconvenience for vehicles.