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1.0 INTRODUCTION This report addresses the need to evaluate truck-weight enforcement activities and provides the practitioner with procedures for conducting required studies. Users are first told what information needs to be gathered, i.e., Measures of Effectiveness (M.O.E.s). Application of the M.O.E.s is then detailed in study methods describing sampling proce- dures and data-analysis operations. Candidate M.O.E.s were developed on the basis of truck weight enforcement ob- jectives, and final M.O.E.s were determined via their ranked abilities to meet highway and enforcement agency needs. Developed M.O.E.s were then validated in a four-state study to confirm their sensitivity to actual enforcement activity. M.O.E sampling procedures, applicable to evaluate statewide/regional truck weight enforcement programs, were developed via a statistical analysis of nationwide data (See Appendix F). The user is provided with the resulting sampling guidelines. Study site number requirements are estimated for specified highway-functional and truck- percentage categories. Site-specific sample size requirements are also designated. A software data analysis tool' i.e., the Truck Weight Enforcement Evaluation Tool (TWEET), is provided for the user to compare M.O.E. results between two conditions, e.g., with- and without-enforcement activity. The software also estimates pavement service life effects as a function of the enforcement activity. This report is organized into Free content sections. First, current truck weight en- forcement monitoring practice is briefly reviewed with emphasis on effectiveness meas- urement requirements. Second, M.O.E.s are defined in the context of their developmen- tal and field validation results. Finally, a User Guide provides practitioners with proce- dures to evaluate truck weight enforcement activity and applies validated M.O.E.s that were developed and tested in the current research project. The User Guide consists of two parts: sampling guidelines and a software data analysis tool.