Acknowledgements

Acknowledgments

The chapter presents the results of a research project financed by the Swiss Federal Road Authority, whose support is gratefully acknowledged. Earlier versions of this chapter have been presented at the Colloquium in memory of Prof. Marvin L. Manheim, Antwerp, and at the 5th STRC conference, Ascona. We would like to thank the participants at these conferences and Kay Axhausen (Zurich), Michel Bierlaire (Lausanne), Romeo Danielis (Trieste) and an anonymous referee for their helpful comments.