Irregularly Sampled Transit Vehicles used as a Probe Vehicle Traffic Sensor

This report describes a project in which irregularly sampled position transit vehicles are used as probes to estimate traffic conditions. A framework is developed for modeling the time series that come from sampling transit vehicle locations as a function of time. The vehicle location samples are obtained from the King County Metro Automatic Vehicle Location (AVL) system. An optimal filter method is used to estimate speed as function of speed and time.
Publication Date: 
Monday, March 1, 1999
Publication Number: 
WA-RD 469.1
Last modified: 
10/12/2016 - 15:41
Daniel J. Dailey, Chandrasekar Elango.
Washington State Transportation Center (TRAC)
Number of Pages: 
Automatic vehicle location, Buses, Kalman filtering, Probe vehicles, Traffic flow, Travel time.