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Spatiotemporal Effects of Segregating Different Vehicle Classes on Separate Lanes

In: Transportation and Traffic Theory 2009: Golden Jubilee

Author

Listed:
  • Michael J. Cassidy

    (University of California)

  • Carlos F. Daganzo

    (University of California)

  • Kitae Jang

    (University of California)

  • Koohong Chung

    (California Department of Transportation)

Abstract

The paper explores some of the impacts of setting aside road lanes for the exclusive use of select vehicle classes. We examine first the case of lanes that are reserved for carpools, and then extend the analysis to bus-only lanes. In doing so, the paper makes three contributions. The first is methodological: it illustrates the importance of analyzing freeway data in full spatiotemporal detail. The second is physical: data reveal that carpool lanes are not as damaging as previously reported. In fact, these lanes are found to smooth traffic in adjacent lanes so much (by diminishing disruptive vehicle interactions near bottlenecks) that even substantially underutilized carpool lanes can increase bottleneck discharge flows. The third contribution is theoretical: it uses the smoothing phenomenon to show how the judicious deployment of bus-only lanes on freeways and city streets can favorably affect not just buses, but also cars.

Suggested Citation

  • Michael J. Cassidy & Carlos F. Daganzo & Kitae Jang & Koohong Chung, 2009. "Spatiotemporal Effects of Segregating Different Vehicle Classes on Separate Lanes," Springer Books, in: William H. K. Lam & S. C. Wong & Hong K. Lo (ed.), Transportation and Traffic Theory 2009: Golden Jubilee, chapter 0, pages 57-74, Springer.
    • Handle: RePEc:spr:sprchp:978-1-4419-0820-9_4
    DOI: 10.1007/978-1-4419-0820-9_4
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    Citations

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    Cited by:

    1. Jang, Kitae & Cassidy, Michael J., 2011. "Dual Influences on Vehicle Speeds in Special-Use Lanes and Policy Implications," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt0dd859tf, Institute of Transportation Studies, UC Berkeley.
    2. Jin, Wen-Long, 2013. "A multi-commodity Lighthill–Whitham–Richards model of lane-changing traffic flow," Transportation Research Part B: Methodological, Elsevier, vol. 57(C), pages 361-377.
    3. Guler, S. Ilgin & Cassidy, Michael J., 2012. "Strategies for sharing bottleneck capacity among buses and cars," Transportation Research Part B: Methodological, Elsevier, vol. 46(10), pages 1334-1345.
    4. Li, Xiaopeng & Cui, Jianxun & An, Shi & Parsafard, Mohsen, 2014. "Stop-and-go traffic analysis: Theoretical properties, environmental impacts and oscillation mitigation," Transportation Research Part B: Methodological, Elsevier, vol. 70(C), pages 319-339.
    5. Cassidy, Michael J. & Kim, Kwangho & Ni, Wei & Gu, Weihua, 2015. "A problem of limited-access special lanes. Part II: Exploring remedies via simulation," Transportation Research Part A: Policy and Practice, Elsevier, vol. 80(C), pages 320-329.
    6. Guler, Ilgin & Cassidy, Michael, 2010. "Deploying Underutilized Bus Lanes at Key Nodes in a Road Network," Institute of Transportation Studies, Research Reports, Working Papers, Proceedings qt3fh273s9, Institute of Transportation Studies, UC Berkeley.
    7. Jang, Kitae & Cassidy, Michael J., 2012. "Dual influences on vehicle speed in special-use lanes and critique of US regulation," Transportation Research Part A: Policy and Practice, Elsevier, vol. 46(7), pages 1108-1123.
    8. Cassidy, Michael J. & Kim, Kwangho & Ni, Wei & Gu, Weihua, 2015. "A problem of limited-access special lanes. Part I: Spatiotemporal studies of real freeway traffic," Transportation Research Part A: Policy and Practice, Elsevier, vol. 80(C), pages 307-319.

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