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Time constraints and travel behaviour

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  • David Metz

Abstract

Considerable observational evidence indicates that travel time, averaged across a population, is stable at about an hour a day. This implies both an upper and a lower bound to time that can be expended on travel. The upper bound explains the self-limiting nature of road traffic congestion, as well as the difficulty experienced in attempting mitigation: the prospect of delays deters some road users, who are attracted back following interventions aimed at relieving congestion. The lower bound implies that time savings cannot be the main economic benefit of transport investment, which means that conventional transport economic appraisal is misleading. In reality, the main benefit for users is increased access to desired destinations, made possible by faster travel, which is the origin of induced traffic. Access is subject to saturation, consistent with the evidence of travel demand saturation. However, access is difficult to monetise for inclusion in cost–benefit analysis. Consequential uplift in real estate values may be a more practical way of estimating access benefits, which is relevant to the possibility of capturing part of such uplift to help fund transport investment that enhances such access.

Suggested Citation

  • David Metz, 2021. "Time constraints and travel behaviour," Transportation Planning and Technology, Taylor & Francis Journals, vol. 44(1), pages 16-29, January.
    • Handle: RePEc:taf:transp:v:44:y:2021:i:1:p:16-29
    DOI: 10.1080/03081060.2020.1851445
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    Cited by:

    1. Metz, David, 2021. "Economic benefits of road widening: Discrepancy between outturn and forecast," Transportation Research Part A: Policy and Practice, Elsevier, vol. 147(C), pages 312-319.
    2. David Metz, 2023. "Drivers’ Perspectives of Car Dependence," Urban Planning, Cogitatio Press, vol. 8(3), pages 126-134.
    3. Wan, Li & Tang, Junqing & Wang, Lihua & Schooling, Jennifer, 2021. "Understanding non-commuting travel demand of car commuters – Insights from ANPR trip chain data in Cambridge," Transport Policy, Elsevier, vol. 106(C), pages 76-87.
    4. Ryan, Jean & Martens, Karel, 2023. "Defining and implementing a sufficient level of accessibility: What’s stopping us?," Transportation Research Part A: Policy and Practice, Elsevier, vol. 175(C).

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