Linking Transport and Land Use Planning. The Microscopic Dynamic Simulation Model ILUMASS

Abstract

The project ILUMASS (Integrated Land-Use Modelling and Transportation System Simulation) aims at embedding a microscopic dynamic simulation model of urban traffic flows into a comprehensive model system incorporating changes of land use, the resulting changes in transport demand, and the impacts of transport on the environment. Microsimulation modules include models of demographic development, household formation, firm liefecycles, residential and non-residental construction, labour mobility on the regional labour market and household mobility on the regional housing market. These modules will be closely linked with the models of daily activity patterns and travel and goods movements modelled in the transport parts of ILUMASS. The acquisition of data of daily activity patterns are described in a new approach. The goal was to utilize a computerized hand-held survey instrument that allows the gathering of information from subjects at regular intervals as close in time to real decision points. The computerized platform, a handheld personal digital assistant (PDA), also enables the instrument to automatically trace and/or prompt for certain attributes of the decisions process. The ILUMASS project aims at intergrating modules to a complete modelling system. In the ILUMASS model system there are both uni-dimensional cause-effect realtionships as well as strongly linked connections between the activity reports of the surveyed individuals, the daily modules. Consistency between the data set thus necessitates consideration of the interactions between the modules. The solution of this problem therefore requires an iterative approach.