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Speed and Delay on Signalized Arterials

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  • David Levinson

    (Nexus (Networks, Economics, and Urban Systems) Research Group, Department of Civil Engineering, University of Minnesota)

Abstract

This research presents a model to predict the influence of demand and capacity on the running speed of signalized arterials in Montgomery County, Maryland. The model separates the changes to link running speed due to same-direction traffic and intersection approach delay from cross traffic. It is found that flow has a small impact on link speed, each 1000 vehicles per lane per hour reduces speed by 4 - 8 kph. Longer links have higher speeds, indicating that they more closely approximate free-flow conditions. A surprising result comes from measuring the effect of an additional lane on link speed, after controlling for flow per lane. It is found that there are slight diseconomies of additional lanes in terms of speed, each additional lane is associated with somewhat slower speeds. Measures of intersection and link travel times are also compared. Although link running times exceed intersection stopped delay, total intersection delay (stopped and approach) exceeds the delay caused by same-direction traffic. This information can inform investment decisions about roadway and intersection improvements.

Suggested Citation

  • David Levinson, 1998. "Speed and Delay on Signalized Arterials," Working Papers 199803, University of Minnesota: Nexus Research Group.
    • Handle: RePEc:nex:wpaper:speed
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    File URL: http://hdl.handle.net/11299/179862
    File Function: First version, 2007
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    References listed on IDEAS

    as
    1. Horowitz, Alan J., 1989. "Tests of an ad hoc algorithm of elastic- demand equilibrium traffic assignment," Transportation Research Part B: Methodological, Elsevier, vol. 23(4), pages 309-313, August.
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    Cited by:

    1. Genevieve Giuliano & Peter Gordon & Qisheng Pan & JiYoung Park, 2010. "Accessibility and Residential Land Values: Some Tests with New Measures," Urban Studies, Urban Studies Journal Limited, vol. 47(14), pages 3103-3130, December.
    2. David Levinson & Yuanlin Huang, 1997. "A Windowed Transportation Planning Model," Working Papers 199703, University of Minnesota: Nexus Research Group.
    3. David Levinson & Ajay Kumar, 1994. "Integrating Feedback into the Transportation Planning Mode," Working Papers 199404, University of Minnesota: Nexus Research Group.

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    More about this item

    Keywords

    volume-delay function; signal delay; approach delay; traffic flow theory; running speed; highway capacity; Montgomery County Maryland .;
    All these keywords.

    JEL classification:

    • R40 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - Transportation Economics - - - General
    • R48 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - Transportation Economics - - - Government Pricing and Policy

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