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Journey time estimation using single inductive loop detectors on non-signalised links

Author

Listed:
  • T Cherrett

    (The Transportation Research Group, University of Southampton)

  • F Mcleod

    (The Transportation Research Group, University of Southampton)

  • H Bell

    (The Transportation Research Group, University of Southampton)

  • M McDonald

    (The Transportation Research Group, University of Southampton)

Abstract

This paper describes two techniques designed to estimate vehicle journey times on non-signalised roads, using 250 ms digital loop-occupancy data produced by single inductive loop detectors. A mechanistic and a neural network approach provided historical journey time estimates every 30 s, based on the data collected from the previous 30 s period. These 30 s estimates would provide the traffic network operator with immediate post-event congestion information on roads where no close circuit television cameras were present. The mechanistic approach estimated journey times every 30 s between pairs of detectors, using the knowledge of vehicle speed derived from the loops and the distances between them. The 30 s average loop-occupancy time per vehicle, average time-gap between vehicles and percentage occupancy parameters derived from the inductive loops were presented to a neural network for training along with the associated vehicles' measured journey times. The neural network was shown to consistently out-perform the mechanistic approach (in terms of the mean absolute percentage deviation from the mean measured travel time), particularly when using pairs of detectors.

Suggested Citation

  • T Cherrett & F Mcleod & H Bell & M McDonald, 2002. "Journey time estimation using single inductive loop detectors on non-signalised links," Journal of the Operational Research Society, Palgrave Macmillan;The OR Society, vol. 53(6), pages 610-619, June.
    • Handle: RePEc:pal:jorsoc:v:53:y:2002:i:6:d:10.1057_palgrave.jors.2601348
    DOI: 10.1057/palgrave.jors.2601348
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    Cited by:

    1. B J Waterson & T J Cherrett & M McDonald, 2005. "The use of simulation in the design of a road transport incident detection algorithm," Journal of the Operational Research Society, Palgrave Macmillan;The OR Society, vol. 56(11), pages 1250-1257, November.

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