ABSTRACT
Regional transport system simulation is most often based on a computerized model system that contains the resident population’s social, demographic, economic, and location characteristics. The system also contains statistical models of travel behavior that use as input the population characteristics to predict the number of trips people make and the places among which these trips are made, the means used to travel among these places, and the routes chosen to get from one place to another. One system designed to do this in sequence is called the four-step model system, and it has been under continuous scrutiny for the past 30 years (e.g., see the resource papers from the 1972 conference on Urban Travel Demand Forecasting, published by the Highway Research Board, now named the Transportation Research Board, in Special Report 143).
