zywvutsrpo HEADWAY AND SAFETY ANALYSIS OF SPEED LAW ENFORCEMENT TECHNIQUES IN HIGHWAY WORK ZONES Ming-Heng Wang*, Ph.D. Post Doctoral Researcher Transportation Research Institute The University of Kansas 2160 Learned Hall, 1530 W. 15th Street, Lawrence, Kansas 66045 Phone : (785)-766-0339 Fax: (785) 864-3199 E-mail : mwang4@ku.edu Rahim (Ray) F. Benekohal, Ph.D. Professor Department of Civil and Environmental Engineering The University of Illinois at Urbana-Champaign R1213 NCEL205 N. Mathews Ave. Urbana, IL 61801 USA Phone: (217)-244-6288 Fax: (217)-333-1924 E-mail : rbenekoh@illinois.edu Hani Ramezani Graduate Research Assistant Department of Civil and Environmental Engineering B106 Newmark Civil Engineering Laboratory University of Illinois at Urbana-Champaign, Urbana, IL 61801 USA E-mail: Hrameza2@illinois.edu Phone: (217) 333-5967 *: Corresponding Author Word Count: 4522 Figures and Tables: 8 Submitted for Presentation at the 89 th TRB Annual Meeting First Submitted: August 1 st , 2009 Revision submitted: Nov 15 th , 2009