| This paper sums up the research of traffic impact assessment (TIA), advancing a regional TIA (R-TIA) thought to deal with large-scale urban development and land-use of increasing speed and intensity in the limitations and inadequacies of existing site TIA methods. It aims to: total control of a regional TIA method and combination of site TIA to balance the problem between urban land-use and transport supply, and effectively guide the rational urban land-use.The paper summarizes the past studes of the development of the urban transport system interaction theory line with the existing site TIA method and proposed regional TIA method and models essential to assort between land use and transportation capacity on meso-scope to balance excessive travel demand to inadequate supply of transport system in the acute contradictions.The paper researchs on interaction between regional land use and traffic demand and builds a regional travel demand analysis model, which is a population size-land use-trip related travel demand model; introducts accessibility index and researchs on the supply capacity of the transport system to the residents'travel activities.It is selected Guangnei-Street district region for study in XuanWu District, Beijing. The regional land-use capacity of the selected objective is developed and it explores impact of mixed land use for the future transport system, the establishment of the regional road network simulation models is to certificate the research results, supporting the need sand feasibility for the study of R-TIA.It is shown that the R-TIA method has better predictability for the future urban land use, and its combined use with site traffic impact assessment methods, will be able to provide more effective guarantee for urban land-use scientific, reasonable, controllable.
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