An Optimization Method For Traffic Organization At Signalized Intersections

With the development of economy, the vehicle volume of city increased rapidly and the traffic jam became more serious. We must take some measures to deal with the serious traffic jam that will counterwork our economy development. To urban road, the key is intersections where all traffic streams converge and turn. In China city the mixed traffic of intersections make order become rough and tumble. This situation is especially grievous for at-grade intersections. In addition, at-grade intersection is the main format of intersection in city. So we must attach importance to its management and control.For at-grade intersections, with the volume increasing the more efficient mean is signalized control. Up to 2000, there are 1036 signalized intersections in Beijing. But the traffic jam is still serious at intersections. One of the main causes is that the traffic organization is not well leading to use the road inefficiently. The paper chooses the signalized intersection as the research object and studies its optimization method of traffic organization to abate the traffic jam.First, the paper makes a summary of process of traffic organization at signalized intersection. According to the process, the paper makes a detailed account of every step. The primary step includes discharging mode design, signal design and channelization design of signalized intersection. The first step is particular in our country because of the bicycles. The paper sums up the existing discharging mode based on the former experiences and put forward the method and procedure of discharging mode design. The second item has been mature in home and abroad. So the paper only summarizes its universal knowledge. As for channelization design, on the base of existing research the paper put forward some new opinions that primarily include basic concept, channelized measure and its applicability, channelization design procedure etc.After introducing the basic method of traffic organization at signalized intersection, according to the characteristic the paper put forward an idea that using Expert System to help the traffic organization optimization. Then the paper makes detailed design of knowledge storeroom and consequence mechanism that are the important part of the Expert System. Based on the design, the paper makes the system become realization through writing code. Finally we select two signalized intersections to validate the system. By validating we find the system works well.