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Improved Estimates of Travel Time From Real Time Inductance Loop Sensors

Description: The Real Time Motorist Information System (RTMIS) under development at the University of Washington uses a ratio of Volume to Occupancy with a correction factor (often denoted as "g") to estimate speed. This correction factor is a function of road topology and occupancy. This project will initially produce a value for the correction factor for every pair of loops being used in the RTMIS. It will further produce a correlation between correction factor and occupancy for each set of loop pairs. The correction factor is produced using speed estimates from cross-correlation time delay measurements of on road data.

  • Date Published: May, 1993
  • Publication Number: WA-RD 292.1
  • Last Modified: October 15, 2007
  • Authors: Daniel J. Dailey, Mark P. Haselkorn, Nancy L. Nihan.
  • Originator: Washington State Transportation Center (TRAC)
  • # of Pages: 56 p., 831 KB (PDF)
  • Subject: Cross correlation, Estimates, Loop detectors, Real time information, Speed, Traffic volume, Travel time.
  • Keywords: Induction loop, speed, cross correlation, volume occupancy.
  • Related Publications:


This abstract was last modified April 29, 2008