Paper No. 02-3790 Analysis of Crash Precursors on Instrumented Freeways Chris Lee Department of Civil Engineering University of Waterloo Waterloo, Ontario, Canada N2L 3G1 Tel: (519) 888-4567 ext. 6596 Fax: (519) 888-6197 E-mail: chclee@uwaterloo.ca Frank Saccomanno Department of Civil Engineering University of Waterloo Waterloo, Ontario, Canada N2L 3G1 Tel: (519) 888-4567 ext. 2631 Fax: (519) 888-6197 E-mail: saccoman@uwaterloo.ca Bruce Hellinga Department of Civil Engineering University of Waterloo Waterloo, Ontario, Canada N2L 3G1 Tel: (519) 888-4567 ext. 2630 Fax: (519) 888-6197 E-mail: bhellinga@uwaterloo.ca Words: 5,619 + 6 * 250 = 7,119 words Paper submitted for the publication in the Transportation Research Record 2002