The Planning And Design Theory Of High-efficiency Integrated Transit Priority Corridor

As an important product of the urbanization and motorization,transport corridor is the concentrated transfer corridor of people and vehicles,has been gradually applied to the construction and management of urban infrastructure,and has become the key planning and design object to alleviate traffic congestion in the network.However,there exist many traffic modes in the transport corridor,and the related traffic management measures are very complex,which results in the insignificant effect of the construction of single mode,and seriously restricted the high-efficiency development of the corridor.Therefore,in order to strengthen the complement and connection of the design elements,the concept of integrated corridor management is proposed and applied in the planning and design of transport corridor.Meanwhile,prioritization of public transport has changed the current construction status of taking the cars as the object of the corridor,and put forward new requirements for the planning and design theory of transport corridor.This research presents a new planning and design theory of a high-efficiency integrated transit priority corridor that is adaptable to the reality of implementation environment to meet the needs of integrated improvement of transport corridor and prioritization of public transport.This study aims to establish effective resource allocation mechanism between public transit system and social vehicle system to improve the efficiency of integrated transport corridor,and further to improve the traffic operation environment of urban transport network.Based on the previous related studies,this research is focused on the planning and design theory of integrated transit priority corridor via the methodologies of system theory,traffic engineering,network design and computer science etc.Firstly,the critical research contents and methods of high-efficient transit priority corridor are analyzed based on studies of the urban transport network design problem.Three key design aspects,which are road space allocation,bus route network optimization and transit priority design at intersection,are stated to establish perfect theory system of high-efficient transit priority corridor.Secondly,based on the analysis and aiming at the limitation of disperse exclusive bus lane(XBL)locating,this paper creatively proposes a bi-level optimization model by taking discrete degree of XBLs and the minimum length of continuous XBLs as the constraint.The upper-level of the proposed model is the locating model to minimize the total travel time of the whole road network and minimize the degree of XBLs at intersections.And the lower-level is the allocation model of car and bus to minimize the generalized travel cost.The modified genetic algorithm based on the method of successive averages is developed to solve the problem.The effectiveness and practicability of the model,the sensitivity analysis of the key parameters and the superiority of continuous XBLs are carried out through a case study.Thirdly,to overcome the limitations of previous studies on XBLs,the effective resource allocation mechanism between public transit system and social traffic system is investigated.Considering the correlation between XBLs and transit route,an integrated optimization model to simultaneously locate XBLs and adjustment of transit route design and frequency settings along urban transport corridors is developed.The genetic algorithm based on the method of successive averages is developed to solve the problem.The reasonability and practicability of the proposed simultaneous model is tested through a case study.The result shows that simultaneous optimization design approach of bus-only lane and transit route network is preferable to simply optimize bus lane location,or adjust the transit route network and frequency.Finally,a new design method of transit priority at intersections from the network optimization level is investigated in this paper.Given the road space allocations on transport corridor,XBL locations at the intersection which need be coordinated with XBLs on sections is analyzed and a model is proposed to solve the integrated design and operation of exclusive bus lane location,lane functional allocation and passive bus priority design with the objective of minimizing the total travel time by car and bus users.Numerical studies have demonstrated the effectiveness of the proposed model and algorithm.The major innovative contribution of this dissertation is summarized as follows.The planning and design theory and method of high-effective integrated transit priority corridor is analyzed and researched in depth regarding the main factors to be considered for the system.Based on the analysis at the limitation of disperse exclusive bus lane(XBL)locating and operating practice,a optimization locating model of continuous XBLs is developed by taking discrete degree of XBLs as the object and the minimum length of continuous XBLs as the constraint,to mitigate traffic congestion under discrete situation.By extending transit priority design from an isolated intersection or XBL locating in a non-signal controlled network to network optimization method of transit priority,an optimum design method of transit signal priority at intersections is proposed in this paper to realize the combinational planning and design of XBLs and transit signal priority.By introducing the maximal attractive region for passenger flow around transit corridor,an integrated optimization model to simultaneously locate XBLs and adjustment of transit route design and frequency settings along urban transport corridors is developed to better deal with the planning and design of transport corridor in multi-mode traffic system and accurately reflect the realistic conditions in the transport network.Besides,all the models developed in this paper need to be extended in the farther studies.And to test the model in the reality urban road network is another important subject for research in the future.