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Post-project evaluation of travel demand forecasts: Implications from the case of a Japanese railway

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  • Sanko, Nobuhiro
  • Morikawa, Takayuki
  • Nagamatsu, Yoshitaka

Abstract

Inaccuracies in forecasting create serious problems for transportation projects. To improve forecasting accuracy, researchers must investigate the reasons for the inaccuracies. However, very little research has been done, and the percentage of errors for each reason has rarely been examined. After perusing various studies on forecasting inaccuracies, the authors determined that an in-depth case study was necessary. This paper describes such a case study: an overestimate in a forecast of travel demand, forecast using the four-step method, for the Tokadai Line rail service in a suburb of Nagoya, Japan. The paper examines the following factors behind the errors: target area, population, modal split, failure to consider the effects of a competing railway, inappropriate selection of modal choice model, and an incomplete network. Through this case, three implications of general inaccuracies in forecasting are presented. First, while previous studies have shown that input uncertainties are larger than model uncertainties, this does not mean that inputs cause larger errors. Second, the uncertainties related to inputs must be prioritised. Finally, the reasons for the inaccuracies are more difficult than expected to identify, since the same inaccuracies can be explained by more than one reason.

Suggested Citation

  • Sanko, Nobuhiro & Morikawa, Takayuki & Nagamatsu, Yoshitaka, 2013. "Post-project evaluation of travel demand forecasts: Implications from the case of a Japanese railway," Transport Policy, Elsevier, vol. 27(C), pages 209-218.
    • Handle: RePEc:eee:trapol:v:27:y:2013:i:c:p:209-218
    DOI: 10.1016/j.tranpol.2013.02.002
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    References listed on IDEAS

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    1. Parthasarathi, Pavithra & Levinson, David, 2010. "Post-construction evaluation of traffic forecast accuracy," Transport Policy, Elsevier, vol. 17(6), pages 428-443, November.
    2. Joseph Berechman & Li Chen, 2011. "Incorporating Risk of Cost Overruns into Transportation Capital Projects Decision-Making," Journal of Transport Economics and Policy, University of Bath, vol. 45(1), pages 83-103, January.
    3. Nobuhiro Sanko & Takayuki Morikawa, 2010. "Temporal transferability of updated alternative-specific constants in disaggregate mode choice models," Transportation, Springer, vol. 37(2), pages 203-219, March.
    4. Gerard Jong & Andrew Daly & Marits Pieters & Stephen Miller & Ronald Plasmeijer & Frank Hofman, 2007. "Uncertainty in traffic forecasts: literature review and new results for The Netherlands," Transportation, Springer, vol. 34(4), pages 375-395, July.
    5. Flyvbjerg,Bent & Bruzelius,Nils & Rothengatter,Werner, 2003. "Megaprojects and Risk," Cambridge Books, Cambridge University Press, number 9780521009461.
    6. Anguera, Ricard, 2006. "The Channel Tunnel--an ex post economic evaluation," Transportation Research Part A: Policy and Practice, Elsevier, vol. 40(4), pages 291-315, May.
    7. Yong Zhao & Kara Maria Kockelman, 2002. "The propagation of uncertainty through travel demand models: An exploratory analysis," The Annals of Regional Science, Springer;Western Regional Science Association, vol. 36(1), pages 145-163.
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    Cited by:

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    3. Lijie Yu & Yarong Cong & Kuanmin Chen, 2020. "Determination of the Peak Hour Ridership of Metro Stations in Xi’an, China Using Geographically-Weighted Regression," Sustainability, MDPI, vol. 12(6), pages 1-22, March.

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