The objective of this research, NCHRP Project 14-20A Consequences of Delayed Maintenance of Highway Assets, was to develop processes for quantifying the consequences of the delayed application of maintenance treatments on highway pavements, bridges, and other physical assets. The research expressed consequences in terms of performance indicators (e.g., distress and level of service), costs to owners and road users, and other relevant factors and defined delayed maintenance applications by (1) the inability to meet the agency-defined application schedule or (2) the available budget relative to an unconstrained budget (i.e., availability of the funds required to perform all needed maintenance). 

The objectives of this project, NCHRP 14-09(4) Role of Highway Maintenance in Integrated Management Systems, were to design an idealized Maintenance Management Information System (MMIS) based on data available from all transportation information systems and develop a guide to assist state transportation agencies in moving toward implementation. 
The final report has been published as NCHRP Report 363, "Role of Highway Maintenance in Integrated Management Systems." This report outlines a framework for integrating maintenance management with other highway and administrative management functions. This framework considers the next generation of maintenance management systems, and how they must respond to the organizational, political, and technological trends that have emerged in recent years.
The report can be found at http://onlinepubs.trb.org/Onlinepubs/nchrp/nchrp_rpt_363.pdf

The objective of this research, NCHRP 13-04, was to develop a Guide for Optimal Replacement Cycles of Highway Operations Equipment. The guide included processes and tools for consideration in making decisions regarding the optimal replacement cycles of on- and off-road highway operations equipment used by state highway agencies.
The study’s report, Research Report 879: Optimal Replacement Cycles of Highway Operations Equipment, acts as a handbook on equipment replacement concepts and an instruction manual for making cost-effective replacement decisions. The research report presents a process for determining replacement needs for highway operations equipment, identifying candidate equipment units for replacement, and preparing an annual equipment replacement program. The products include a guidance document and an Excel-based replacement optimization tool to support the equipment replacement process and facilitate its implementation.