Traffic Safety Operation Evaluation And Technology For City Road Bridge-tunnel Connection Section

With the increasing requirement for city road mileage and capacity, viaduct,crossing–river bridge, under-crossing tunnel and transmountain tunnel have becomenecessities for urban multi-level transportation. Moreover, these bridges and tunnels (BAT)have the characteristics of Staggered and Overwhelmed distribution, thus it inevitably bringsthe problem of junction among them. Urban BAT has demonstrated an example for thecomplex mountain road conditions described in former days. Especially for mountainous city,like Chongqing, the junctions for BAT have occupied a substantial proportion in city road. Asa special structure for city road system, BAT has a worse traffic operation condition comparedwith general road section. What’s more, the situation becomes even much worse inbridge-tunnel connection section (BTCS) which are considered to be traffic accidents blackspots. However, there still lacks systematic traffic safety evaluation theory and thecorresponding security protection technology for urban road BTCS. In light of this, it isnecessary to carry on research in area of urban road BTCS and then develop a scientific trafficsafety evaluation theory.This thesis, as a summary of the study for BTCS, develops from the viewpoint of systemtheory. The main topics that covered in the thesis include definition and classification forurban road BTCS, traffic operation analysis for BTCS, Influencing factors for traffic accident,traffic safety evaluation, and finally the traffic safety protection technology. The objective ofthis thesis is to develop a systemic theory for traffic safety operation for BTCS and giveguidance to mountainous city traffic operation evaluation. The proposed theory will alsobenefit the evaluation for traffic operation of non-mountainous city. The contribution of thisthesis is listed below. First, it gives a definite scope for BTCS and the analysis of trafficoperation in this range. Furthermore, based on the measurement of safety distance, thedefinition for BTCS has been given from the perspective of traffic safety operation. Inaddition, the classification for BTCS is also developed as for whether bridge and tunnels hasthe ability of Traffic flow direction Conversion function. Consequently, the author proposessafety distance calculation model for different BTCS clarifies scope for BTCS and analyzestraffic operation environment and characteristics for BTCS. Secondly, the thesis has studied on traffic accident distribution rules for BTCS and summarized the main influencingfactors correspondingly. Based on this study, the author has constructed the Evaluation IndexSystem for urban road BTCS traffic safety operation using Analytic Hierarchy Process (AHP).Moreover, a comprehensive evaluation system has set up based on improved fuzzy evaluationmethod cluster analysis of weight. As a result, a four-class safety classification index systemhas developed and a further study for traffic safety technology has carried out.Finally, this thesis has exemplified the proposed analysis evaluation method with a studyon real situation for BTCS in Huanghuayuan Bridge-Shiyuan Tunnel from Yuzhong District,Chongqing. The developed theory has shown preliminary result for this area. The resultsdemonstrate the scientificity, feasibility and innovation of this thesis.