Research On Public Traffic Transfer Problem In Big City Based On Outburst Passenger Flow Conditions

With the rapid development of economy, the demand for material and culture is growingincreasingly. In recent years, large-scale cultural and sports activities have been frequentlyorganized in many major cities, which can both meet the needs of material and cultural andpromote the development of the city. However, the traffic generated suddenly that comesalong seriously traffic congestion. Currently, some of large cities already have measures andexperience to deal with sudden passenger flow and many researchers have proposed variousoptimization methods. Nevertheless, the measurements and methods mostly focused on howto effectively evacuate the sudden flow and relieve traffic congestion from a macro point ofview, which lack of research on the public transit efficiency and the promotion of servicelevels. The phenomenon of difficult public traffic transfer and low transfer efficiency stillexist.To solve the transfer problem and improve the service level of existing public transit,researches should be investigated systematically in a specific range of sudden passenger flow.In this study, the effects of propagation characteristics of sudden passenger flow have beenresearched and the scope of influence is determined by the maximum influence distanceobtained from plume model of gas diffusion theory. A method has been proposed to predictthe induced public traffic, which takes the intersection of the main roads around large activityvenues as nodes to divide traffic zones and assumes that the sudden passenger flow evenlyspreads from the primary node to outward. Specific methods of efficient public transit pathhave been studied and the assignment methods of induced public transport such as multi-pathassignment method, all-or-nothing traffic assignment, and K-shortest path algorithm have alsobeen researched. An assessment indicator system for conventional public traffic transfer hasbeen established using the average transfer distance, the per capita transfer area, the comfortof transfer, the average transfer time, the degree of bus transport capacity, the interval averagespeed as indicators. Also the area of transfer facilities, the degree of nearby bus transportcapacity, the average transfer distance, the average transfer time, the transfer passenger flowhave been used as indicators to establish an assessment indicator system for the transferefficiency of subway stations. Finally, take sport events in Chengdu Sports Center asexamples, the main roads and the public transport routes have been investigated and zoneshave been divided according to the influence scope of sudden passenger flow, subsequently,the sudden passenger flow has been assigned by means of computer programming usingall-or-nothing traffic assignment. Meanwhile, optimized suggestions for transfer have beenmade based on the results of the sudden passenger flow assignment, and fuzzy mathematicaltheory, data envelopment analysis theory have been adopted to evaluate the transfer efficiency for conventional bus stops and subway stations after optimization, respectively. Then, fromthe view of traffic management and passenger travel, improvement suggestions andcountermeasures have been given based on the evaluation results of the analysis.The results indicate a better transfer efficiency of optimized subway stations, while theaverage transfer time has greater impact on conventional public traffic transfer efficiency. Theefficiency of regular public transport after optimization is at a medium level in the transfercase analysis, which can meet the transfer demand during sudden passenger flow. Additionally,the average transfer time is better after optimization than that of the previous, which indicatesthat transfer optimization method described in this paper has a certain practicality.