Improvement Practices of Trip-Based Travel Demand Models:a Case Study of the Second Gen-eration of Triangular Regional Model
Introducing partially disaggregated trip-based models and tour-based models into the four-step modeling framework,and further designing and developing hybrid travel demand models,can enhance the interpretability of travel behavior while avoiding the complexity and computational efficiency problems as-sociated with disaggregate activity models.Reviewing the development of the U.S.triangle regional travel demand model,this paper summarizes the basic information and characteristics of the second generation of the triangle regional model(TRMG2).Combined with the interpretation of the structural design of TRMG2,the paper discusses important improvements of TRMG2 in the modeling method based on trip-based theory,focusing on advanced travel demand modeling methods such as the population reconstruction model with population synthesis,the trip generation model based on trip chains,nested destination choice models,and travel behavior selection models considering accessibility.Finally,to address the current status and problems in urban travel demand models development in China,the paper proposes development strat-egies in four aspects:institutionalizing working mechanism,refining model development,transitioning model theory to practices,and publicizing model outcomes.
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