Improved Estimates of Travel Time From Real Time Inductance Loop Sensors

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.

Publication Date: 
Saturday, May 1, 1993
Publication Number: 
WA-RD 292.1
Last modified: 
10/12/2016 - 15:41
Authors: 
Daniel J. Dailey, Mark P. Haselkorn, Nancy L. Nihan.
Originator: 
Washington State Transportation Center (TRAC)
Number of Pages: 
56
Subject: 
Cross correlation, Estimates, Loop detectors, Real time information, Speed, Traffic volume, Travel time.