A complete set of travel-demand models was calibrated for the New Orleans region by using the 1960 origin-destination survey. The general form of the model set was sequential, with care being taken to include transportation system characteristics in all submodels of the modeling set. Other unique features of the model set were that (a) all submodels were stratified by income quartiles; (b) the distribution model used a composite impedance that combined travel time and costs for all modes, (c) the generation model used accessibility and locational measures, and (d) the exogenous input data, required in forecasting, were limited to six data items. The calibrated models were applied to 1980 conditions, and the resulting travel estimates were compared with ground counts. This comparison indicated that the model set could produce reasonably accurate 20-year forecasts.
Abstract