TRB's National Cooperative Highway Research Program (NCHRP) Report 523: Optimal Timing of Pavement Preventive Maintenance Treatment Applications describes a methodology for determining the optimal timing for the application of preventive maintenance treatments to flexible and rigid pavements. NCHRP Report 523 also presents the methodology in the form of a macro-driven Microsoft Excel Visual Basic Application--designated OPTime.
National Academies of Sciences, Engineering, and Medicine. 2004. Optimal Timing of Pavement Preventive Maintenance Treatment Applications. Washington, DC: The National Academies Press. https://doi.org/10.17226/13772.
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