ISSN 1055-1425
July 2003
This work was performed as part of the California PATH Program of the
University of California, in cooperation with the State of California Business,
Transportation, and Housing Agency, Department of Transportation; and the
United States Department of Transportation, Federal Highway Administration.
The contents of this report reect the views of the authors who are responsible
for the facts and the accuracy of the data presented herein. The contents do not
necessarily reect the ofcial views or policies of the State of California. This
report does not constitute a standard, specication, or regulation.
Report for Task Order 4301
CALIFORNIA PATH PROGRAM
INSTITUTE OF TRANSPORTATION STUDIES
UNIVERSITY OF CALIFORNIA, BERKELEY
Freeway Performance
Measurement System (PeMS)
UCB-ITS-PRR-2003-22
California PATH Research Report
Chao Chen
CALIFORNIA PARTNERS FOR ADVANCED TRANSIT AND HIGHWAYS
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