The Access Setting On Main Roads Of Mountain City

With the acceleration of urban land development,the phenomenon of setting openings on both sides of the main road is becoming more and more serious,Chongqing as a typical representative of the mountain city,limited by topography,this issue is more prominent;However,there is no systematic access criterion in the country or local area,to ensure the Chongqing city trunk road traffic safety and traffic capacity,this paper,based on the access management ideas,conduct research on Chongqing main road access setting by comprehensive using of traffic engineering theory,micro simulation technology and collision detection technology,and puts forward the setting method of access spacing of Chongqing arterial road,the main contents of this thesis are as follows:(1)The review of the development of access management technology,introduces the basic concepts,access management application principle and key technology of access management.Through the analysis of the access management technology practical application case,summarizes the positive effects of the technology on energy saving,road traffic safety,traffic efficiency,land development.(2)Through traffic investigation on Chongqing Avenue,establish speed flow models of main road and access road,and the critical gap length of access road vehicles is determined.The distribution and geometric features of access.show: In spite of the problems of the width and the slope of the access,they can be effectively resolved with existing methods;however there is a big problem in the distribution of the access: the access spacings are small,a small spacing will not only leads to low traffic efficiency,but also brings huge security risks.(3)On the basis of existing weaving research.,weaving length,weaving flow,non-weaving flow,weaving ratio four factors are considered,when research on the weaving section of intersections entrance.The velocity model of weaving section is established,and the accuracy is qualified.So,the weaving length model can be calculated.(4)Establish the simulation models of the intersection,based on SSAM model and area collision detection method,analyse the stable distance of intersection.Results show: the stable distance will be different,because of different entrance channelization styles.Finaly,under design capacity,the stability distance is confirmed.(5)On the basis of the weaving length model and downstream stable distance research,combine intersection functional area concept,think positions of the signalized intersection and median opening should be calculated bidirectionally,put forward mountain urban trunk road access spacing comprehensive setting method...