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Stochastic Risk vs. Policy Oriented Uncertainties: The Case of the Alpine Crossings

  • Julien Brunel


    (LET - Laboratoire d'économie des transports - CNRS : UMR5593 - Université Lumière - Lyon II - Ecole Nationale des Travaux Publics de l'Etat)

This paper focuses on uncertainties in traffic forecasting. Three major sources of uncertainties are observed for freight demand models. The first one is the model specification itself. We are not interested by it. The second one concerns uncertainties over forecasting hypotheses. A mean to control such uncertainties lies in the introduction of risk in the Costs Benefits Analysis (CBA). Two directions have been taken by this research. The first one is the theoretical framework of CBA under uncertainty mainly developed after Dixit and Pindyck (1994). The second one is more empirical and uses Monte Carlo simulations. Major results of these researches are presented. Then, we apply them to a large transport investment simulation. These tools cannot be used for all kinds of uncertainties. The second part of this paper deals with the third source of uncertainties i. e. policy oriented uncertainties. For them, previous methods are useless. The current Alpine crossings context shows that transport policy is a major determinant of traffics. Furthermore, long term forecasting cannot exclude the possibility of changes in transport policy. This uncertainty should be controlled. It is the role of strategic modeling.

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Paper provided by HAL in its series Post-Print with number halshs-00095852.

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Date of creation: 2004
Date of revision:
Publication status: Published - Presented, AET. European Transport Conference 2004 – ETC 2004, 4 - 6 october 2004, Strasbourg, 2004, London, United Kingdom
Handle: RePEc:hal:journl:halshs-00095852
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  1. Maggi, Rico, 1992. "Swiss transport policy for Europe? Federalism and the dominance of local issues," Transportation Research Part A: Policy and Practice, Elsevier, vol. 26(2), pages 193-198, March.
  2. Crainic, Teodor Gabriel & Laporte, Gilbert, 1997. "Planning models for freight transportation," European Journal of Operational Research, Elsevier, vol. 97(3), pages 409-438, March.
  3. Bruzelius, Nils & Flyvbjerg, Bent & Rothengatter, Werner, 2002. "Big decisions, big risks. Improving accountability in mega projects," Transport Policy, Elsevier, vol. 9(2), pages 143-154, April.
  4. Xuehao Chu & Steven Polzin, 2000. "Timing rules for major transportation investments," Transportation, Springer, vol. 27(2), pages 201-219, May.
  5. Arrow, Kenneth J & Lind, Robert C, 1970. "Uncertainty and the Evaluation of Public Investment Decisions," American Economic Review, American Economic Association, vol. 60(3), pages 364-78, June.
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