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Uncertainty in the context of highway appraisal

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Abstract

Transport planning is based on traffic forecasts which are subject to great uncertainties. These uncertainties have generally been ignored or, at least, not explicitly included in the planning process. This paper describes the principles behind the estimation of the uncertainty (or range of error) of the forecasts of a traffic model and discusses the means by which this information can be absorbed into the decision-making in transport planning projects. These principles have been applied to the appraisal of a British highway project and throughout the paper reference is made to this project in order to illustrate the results of the practical application of an explicit treatment of uncertainty. It is believed that this approach can and should be developed for application in most areas of transport planning, leading inevitably to an improvement in the quality of the decisions taken.

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References

  • Advisory Committee on Trunk Road Assessment (1977). (Chairman — Sir George Leitch) Report. London: HMSO.

    Google Scholar 

  • Bates, J., Gunn, H. and Roberts, M. (1978). A Disaggregate Model of Household Car Ownership. Research Report 20, Departments of the Environment and Transport.

  • Downes, J. D. and Gyenes, L. (1976). Temporal Stability and Forecasting Ability of Trip Generation Models in Reading. Transport and Road Research Laboratory Report, LR726.

  • Haskey, J. C. (1972). Zonal Trip Flow Error Analysis. Mathematical Advisory Unit Note 241, Department of Transport.

  • Hatjoullis, G. and Wood, D. (1979) “Economic forecasts — an analysis of performance,” The Business Economist (2, Spring)

  • Interim Memorandum, National Traffic Forecasts, Department of Transport, January 1978 (revised in 1978).

  • Martin and Voorhees Associates (1978). A Study of SpeedlFlow Relationships on Rural Motorways and A11 Purpose Dual Carriageways. Department of Transport.

  • Martin and Voorhees Associates (1979). Study of SpeedlFlow Relationships on Rural Single Carriageway Roads. Traffic Engineering Division, Department of Transport.

  • Martin and Voorhees Associates (1980). Highway Appraisal under Uncertainty. Main Report and Technical Report, Department of Transport, 1980 (unpublished).

  • Moore, P. G. (1977). “The manager's struggle with uncertainty,” Journal of the Royal Statistical Society (Part 2).

  • Outram, V. E. and Thompson, E. (1978). “Drivers' perceived cost in route choice,” Transportation Models. Seminar L, PTRC Education and Research Services Limited, July.

  • Pouliquen, Louis Y. (1975). “Risk analysis in project appraisal,” World Bank Staff Occasional Papers No. 11. The John Hopkins University Press.

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Authors and Affiliations

  1. Martin and Voorhees Associates, 112, Strand, WC2R OAA, London, Great Britain

    David J. Ashley

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  1. David J. Ashley
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Ashley, D.J. Uncertainty in the context of highway appraisal. Transportation 9, 249–267 (1980). https://doi.org/10.1007/BF00153867

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  • DOI: https://doi.org/10.1007/BF00153867

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