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.
Washington State Transportation Center (TRAC)
Automatic vehicle location, Buses, Kalman filtering, Probe vehicles, Traffic flow, Travel time.