Study On Spatio-Temporal Threshold And Utility Of Combined Traffic Travel

With the rapid advancement of urbanization,the scope of residents’ travel is expanding,and the modes of travel are more diversified,and the combination of multiple travel modes with public transportation as the main body has become the main development trend,so the role of combined transportation has become more and more prominent.Exploring the principle of combined transportation mode selection plays an important role in guiding residents to shift to combined travel mode,optimizing urban transportation structure,and improving the efficiency of multi-mode transportation network.Therefore,this thesis introduces the spatiotemporal limitation theory and stochastic utility theory respectively,establishes a nested logit model by investigating the data,determines the priority travel mode by the travel utility function and the utility difference function,and analyzes the dynamic change relationship between the transition spatiotemporal threshold and utility.Firstly,taking the combined travel behavior of multi-modal transportation network as the research object,the characteristics of multi-mode transportation network and travel mode are analyzed,and the adaptive travel distance and combined travel mode types of each single travel mode are determined,which provides a basis for the following scenario division,and analyzes the space-time threshold and travel utility by using the space-time prism model in spatiotemporal limitation theory and the utility maximization principle in stochastic utility theory.Secondly,the questionnaire survey is carried out by the combination of RP and SP,and the three travel scenarios of short distance,medium distance and long distance are divided according to the advantageous travel distance of different travel modes,and the level of travel influencing variables and attribute values is determined by the actual travel information,and the questionnaire is designed by uniform design method,and the statistical analysis of the basic information of travelers,travel information and travel intention and the correlation analysis of comfort indicators are carried out on the survey results,and the overall travel characteristics and preferences,as well as comfort,punctuality rate,Safety as an independent variable for comfort-related indicators.Furthermore,according to the survey data,the combined travel utility model is constructed based on the nested logit model,the regression analysis of the model is carried out by Stata software and the fitting effect is verified,and the travel utility function relationship in each scenario is preliminarily obtained from the regression parameters,and the specific influence of traveler characteristic variables and travel mode characteristic variables on the choice of combined travel mode is analyzed.Finally,the specific spatiotemporal relationship utility function obtained after the aggregation of traveler’s characteristic variables is carried out by the averaging method,and the three-dimensional surf graph is drawn by Matlab software to obtain the corresponding utility range interval and travel mode spatiotemporal prism map,the order of travel mode selection in each scenario is analyzed,the single and combined travel mode utility functions are made to make the difference in spatiotemporal relationship utility difference function,and the three-dimensional scatter3 map is drawn by Matlab software.The variation relationship between the spatiotemporal threshold and utility of single and combined travel modes is obtained,and the transition conditions of travel modes under specific travel time difference and travel distance are determined based on the utility difference.