Research On Technical Index Of Vertical Curve Of Ramp Toll Station

At present,with the highway network in China is more perfect and continuous growth of high speed,the number of the construction of the interchange also increased steadily,due to China's current highway closed the whole charging mode,so the expressway interchange fees is also a corresponding increase in the number of stations,but at present the specification of the relevant provisions of expressway ramp toll station the less,the lack of effective guidance in engineering practice,so the study of the location and alignment index of expressway ramp toll station has important practical significance.Firstly,as typical sections of natural environment's dramatic change,road sections of tunnel entrance and exit are analyzed from theirs traffic environment.Through the analysis of the relevant research at home and abroad,on ramp toll station accidents and traffic characteristics were summarized,and the summary based on the analysis,obtained the main factors affecting the efficiency of ramp toll stations,including toll station and toll station sign position selection,linear index and toll station environment four hand.Secondly,based on the characteristics of traffic environment,experiment scene of visual light.dark adaptation is built.On the ramp toll station for setting position,first analyzes the main factors affecting the choice of the location of the general principles,and gives the design should follow,and then analyze the ramp toll station at the entrance to different vehicle driving track and driving rules,aspects of process,vehicle speed and lane change process,confirm the safety distance.The establishment of the minimum distance calculation model based on the given ramp toll station location when the relevant technical indexes of the recommended value.Research on alignment index station ramp toll,analyzed the influence factors of linear ramp toll station indexes are determined,and then based on the identification of stadia and no high,driving comfort,vehicle dynamics principle,drainage requirements and other aspects of the establishment of horizontal and vertical each index of the corresponding calculation model,and gives the ramp toll station alignment index recommended value.Through the analysis of statistical data of traffic accidents on the ramp at the toll station,the continuous downhill security ramp access toll station and the analysis of main factors influencing the traffic safety,and then based on the downhill vehicle brake temperature model,calculated the relationship between the ramp slope and downhill slope length,the ramp toll station in the the section of the set conditions,based on the above analysis,to classify the traffic security grade downhill ramp access road toll station,the flow chart of grade and measures to protect the road of.