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Triangulation of two methods measuring the impacts of a free-floating carsharing system in Germany

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  • Firnkorn, Jörg

Abstract

This article reports on two different methods applied in the same survey (N=1881) to measure the impact of the carsharing system car2go on other transportation modes in Ulm, Germany. The first method calculated how the mobility behavior of respondents would hypothetically be at the present time if car2go was not available. The second method determined the respondents’ past mobility behavior before using car2go. Confounding circumstances were corrected in both approaches through different mechanisms. Comparable methods calculating carsharing impacts have only been applied individually in past studies. This is the first study applying two measurement methods within the same survey, which enables a triangulation. As other influencing parameters were equal (e.g. sampling frame, nonresponse bias, mode of asking, point in time of the survey), the deviating results are assumed to have resulted from the different measurement techniques. The findings indicate a primacy effect (disproportionally high selection of first answer options) having influenced the first measurement and an overestimation of the impact on total kilometers travelled in the second measurement. The comparative findings of this dual-measurement could contribute to research designs of greater precision in future work on carsharing impacts.

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  • Firnkorn, Jörg, 2012. "Triangulation of two methods measuring the impacts of a free-floating carsharing system in Germany," Transportation Research Part A: Policy and Practice, Elsevier, vol. 46(10), pages 1654-1672.
  • Handle: RePEc:eee:transa:v:46:y:2012:i:10:p:1654-1672
    DOI: 10.1016/j.tra.2012.08.003
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    References listed on IDEAS

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    Cited by:

    1. Scott Le Vine, 2014. "A Pareto-efficient market-clearing mechanism for shared-mobility systems," International Journal of Automotive Technology and Management, Inderscience Enterprises Ltd, vol. 14(3/4), pages 271-285.
    2. Susan Shaheen & Nelson Chan & Helen Micheaux, 2015. "One-way carsharing’s evolution and operator perspectives from the Americas," Transportation, Springer, vol. 42(3), pages 519-536, May.
    3. Mehdi Nourinejad & Matthew Roorda, 2015. "Carsharing operations policies: a comparison between one-way and two-way systems," Transportation, Springer, vol. 42(3), pages 497-518, May.
    4. Le Vine, Scott & Adamou, Orestes & Polak, John, 2014. "Predicting new forms of activity/mobility patterns enabled by shared-mobility services through a needs-based stated-response method: Case study of grocery shopping," Transport Policy, Elsevier, vol. 32(C), pages 60-68.
    5. Johanna Kopp & Regine Gerike & Kay Axhausen, 2015. "Do sharing people behave differently? An empirical evaluation of the distinctive mobility patterns of free-floating car-sharing members," Transportation, Springer, vol. 42(3), pages 449-469, May.
    6. Spickermann, Alexander & Grienitz, Volker & von der Gracht, Heiko A., 2014. "Heading towards a multimodal city of the future?," Technological Forecasting and Social Change, Elsevier, vol. 89(C), pages 201-221.
    7. Becker, Henrik & Ciari, Francesco & Axhausen, Kay W., 2017. "Comparing car-sharing schemes in Switzerland: User groups and usage patterns," Transportation Research Part A: Policy and Practice, Elsevier, vol. 97(C), pages 17-29.

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