Study On Adapatability And Technical Indicator Of Double Trumpet Interchange

With the rapid development of China’s economic construction and substantial increase ofcar ownership, the problem of traffic congestion and the size of a freeway interchange areincreasingly prominent and become the focus of widespread concern. Interchange is theimportant part of the highway network system, which is the ties of vehicular trafficconversion among the intersect roads by spatial separation； however double trumpetinterchange is one of the most widely used interchange combinations. Double trumpetinterchange adaptability and technical indicator is a double trumpet interchange designreasonable scale control of double trumpet interchange design and vehicles run smoothly,butalso the basis for the double trumpet interchange design theory continue to develop andmature.In this paper, it researches the classification of double trumpet interchange, and analysisthe traffic conditions, natural conditions, social conditions, influence and economicmanagement factors. At the same time, the operating characteristics of the vehicle speedcharacteristics, weaving area traffic flow characteristics, toll station traffic flow characteristicanalysis of the traffic flow characteristics, the capacity calculation model of double trumpetinterchange is built based on the calculation model using the different sections of the differenttraffic volume characteristic.Through the analysis of the current level of service classificationand evaluation method, based on traffic flow stability analysis, to vehicle speed and trafficdensity as the division standard double trumpet interchange parts service level, put forwardthe method of selecting different design speed service level classification indicators and thelevel of service.Furthermore, according to the connecting section whether setting toll station, studyrespectively connected segment technical indicators. The ideal security clearance model tocalculate the different design speed conditions are based on ideal security clearance value,according to minimum lane changing length model under the condition of different designspeed and different lane number,calculating the length of connection section suggestvalue.Analysis of vehicle track and comfort to calculate the gradient rate reasonable of tollplaza；Based on the calculation of different speed conditions toll plaza length to circulartrajectory of lane changing model；By studying a large vehicle parking toll plaza in thedistance, pointing out the length and slope under different circumstances of the toll plaza toramp on the end of the recommended value.