Monitoring The San Francisco Bay Area Freeway Network Using Probe Vehicles And Random Access Radio Channel

Jean-paul M. G. Linnartz, Marcel Westerman and Rudi Hamerslag

Institute of Transportation Studies, Research Reports, Working Papers, Proceedings from Institute of Transportation Studies, UC Berkeley

Abstract: In this report, the authors describe a method of collecting real-time traffic data from probe vehicles automatically sending traffic reports to one or m ore base stations, connected to a traffic center by a wired communications network. Analyzing and computing road traffic and message traffic flows in the San Francisco Bay Area, the authors study several multi-disciplinary aspects of this data collection technique. The results presented in this report reveal that random access (ALOHA) transmission of traffic messages is a (spectrum) efficient, inexpensive and flexible method for collecting road traffic data and that this approach can provide reliable traffic monitoring. This method allows for the estimation of highly accurate real time link travel times and Automatic Incident Detection (AID) can also be performed.

Keywords: Express highways--California--San Francisco Bay Area--Communication systems; Intelligent Vehicle Highway Systems--California--San Francisco Bay Area; Mobile communication systems--California--San Francisco Bay Area; Traffic surveillance (search for similar items in EconPapers)
Date: 1994-01-01
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