01697753

Component

Existing models in the four-step transport planning framework can simulate travel demands and networks to a high degree of detail, but many rely on fixed economic parameters. As simulators of entire economies, computable general equilibrium (CGE) models have been increasingly applied to estimate the magnitude and distribution of economic impacts from transport improvements both spatially and through markets, including GDP and welfare. Some CGE models are linked with transport network models, but none incorporate full networks or generate a complete set of travel demands, both of which are necessary in the four-step framework. This paper presents an integrated CGE and transport model that generates household trips and simulates a full road network for different time periods, such that the transport submodel can be calibrated and run as a conventional transport model. The model provides a tool for the rapid strategic assessment of transport projects and policies when economic responses cannot be assumed to remain static. In the model, the CGE submodel simulates the behaviour of households and firms interacting in markets, where their behaviour takes trip costs into account. The model then generates trips as a derived demand from agent activities and assigns them to the road network according to user equilibrium, before feeding back trip costs to the CGE submodel. The model is then tested by simulating the WestConnex motorway project under construction in Sydney, with results showing significant increases in welfare for regions close to the improvements. Further development of the model is required to incorporate land-use, mode choice and the generation of freight trips.

This paper was sponsored by TRB committee ADD10 Standing Committee on Transportation and Economic Development.

19-02131

English

26p

2019

Transportation Research Board 98th Annual Meeting

Digital/other

Figures; Maps; References; Tables

Costs; Economic impacts; Equilibrium (Economics); Highways; Households; Networks; Simulation; Travel behavior; Travel demand

Sydney (Australia)

Economics; Highways; Planning and Forecasting

Transportation Research Board Annual Meeting 2019 Paper #19-02131

TRIS, TRB, ATRI

Dec 7 2018 9:36AM