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6 The preventive maintenance optimal timing methodology is problem statement and research objective, and outlines the based on analyzing an agency's performance data gathered scope of the study. Chapter 2 describes the findings of the lit- from applying treatments to pavements at different times. erature search and the preventive maintenance treatments, Because many agencies do not have such data, a plan was applicable to bituminous and concrete-surfaced pavements. developed to assist these agencies in establishing test sections Chapter 3 describes the methodology recommended for ana- and collecting such data. The plan is found in Appendix D. lyzing preventive maintenance data and identifying appro- priate treatments and timing for specific situations. It also ORGANIZATION OF THE REPORT demonstrates the applicability of this methodology using data obtained from SHAs. Chapter 4 summarizes the significant This report consists of four chapters. This chapter pro- conclusions of the project and presents suggestions for future vides the introduction and research approach, describes the research.