Abstract
Based on scenarios for economic, demographic and transport cost developments with the computer model FACTS, forecasts can be made on volume and composition of passenger cars, the yearly kilometrage, the fuel consumption etc. Although the model fits well in the modelling framework of the users and the experiences are satisfying, the model needs some renewing, improvements and enlargements. The most important examples are a new base year, the demand-supply module and the more detailed calculation of air pollution. Among others these intended improvements will be discussed in this paper.