UCI-ITS-WP-02-15 Real-Time Origin-Destination (OD) Estimation via Anonymous Vehicle Tracking Cheol Oh 1 Stephen G. Ritchie 2 Jun-Seok Oh 3 R. Jayakrishnan 4 UCI-ITS-WP-02-15 1 Department of Civil and Environmental Engineering and Institute of Transportation Studies University of California, Irvine; Irvine, CA 92697-3600, U.S.A., cheolo@uci.edu 2 Department of Civil and Environmental Engineering and Institute of Transportation Studies University of California, Irvine; Irvine, CA 92697-3600, U.S.A., sritchie@uci.edu 3 Institute of Transportation Studies University of California, Irvine; Irvine, CA 92697-3600, U.S.A. jsoh@uci.edu 4 Department of Civil and Environmental Engineering and Institute of Transportation Studies University of California, Irvine; Irvine, CA 92697-3600, U.S.A., rjayakri@uci.edu September 2002 Institute of Transportation Studies University of California, Irvine Irvine, CA 92697-3600, U.S.A.