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Empirical Differences Between Time Mean Speed and Space Mean Speed

In: Traffic and Granular Flow ’07

Author

Listed:
  • Victor Knoop

    (Delft University of Technology, Faculty of Civil Engineering and Geosciences)

  • Serge P. Hoogendoorn

    (Delft University of Technology, Faculty of Civil Engineering and Geosciences)

  • Henk van Zuylen

    (Delft University of Technology, Faculty of Civil Engineering and Geosciences)

Abstract

Summary Insight into traffic flow characteristics is often gained using local measurements. To determine macroscopic flow characteristics, time aggregation of microscopic information is required. Usually, a data collection system stores values averaged over time. However, it is well known that a time mean average overestimates the influence of faster vehicles, and consequently overestimates the mean speed. As a direct result, densities, computed from flow and speed, are underestimated. This paper compares the time mean speed and space mean speed, using data of individual car passages on a motorway road stretch. We show that the differences between time mean and space mean averages are substantial, up to a factor four. In particular in the lower speed regions the error is big. We indicate the considerable consequences for the jam density and shock wave speed. Finally, a fundamental diagram based on correctly averaged microscopic data can be fitted much better.

Suggested Citation

  • Victor Knoop & Serge P. Hoogendoorn & Henk van Zuylen, 2009. "Empirical Differences Between Time Mean Speed and Space Mean Speed," Springer Books, in: Cécile Appert-Rolland & François Chevoir & Philippe Gondret & Sylvain Lassarre & Jean-Patrick Lebacq (ed.), Traffic and Granular Flow ’07, pages 351-356, Springer.
    • Handle: RePEc:spr:sprchp:978-3-540-77074-9_36
    DOI: 10.1007/978-3-540-77074-9_36
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