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2 Figure 1. Catastrophic vs. minor guardrail damage. repair of damaged or deteriorated barriers and were not 4. Meet in Washington, DC, with the NCHRP panel to review intended to cover installation issues such as improper instal- the Task 3 interim report approximately 1 month after its lation height. The project scope did not include guidelines for submittal. After the meeting, submit a revised interim maintenance of cable barrier systems. Maintenance of cable report addressing the review comments and decisions at systems was expected to be covered under NCHRP Project the meeting. 22-25, "Development of Guidance for the Selection, Use, and 5. Execute the approved work plan. Maintenance of Cable Barrier Systems." Rigid barriers such 6. Submit the preliminary draft guidelines for review by as the New Jersey shape concrete barrier were not in the scope the panel. Revise the guidelines addressing the review of this project. Proprietary systems were also not in the scope comments. of the project. 7. Submit a final report documenting the entire research To accomplish these objectives, the study was delineated effort. The final report shall describe how the project was into the following seven tasks: conducted and include an appendix with the guidelines. 1. Identify and review completed and ongoing research and 1.3 Organization of Report activities, including international sources, related to the The first chapter presents the critical need to establish quan- project objective. titative guidelines and criteria for the repair of longitudinal 2. Conduct a survey of state and Canadian provincial trans- barriers and the research statement for NCHRP Project 22-23. portation agencies to gather existing policies and guide- Chapter 2 first presents a synthesis of the current repair cri- lines governing inspection and repair of longitudinal teria for longitudinal barriers with crash damage or environ- barriers. The survey should be used to identify the barrier mental deterioration. Chapter 3 presents the research team's systems and the types of damage and deterioration that approach to evaluating the crash performance of longitudinal should be considered in this project. barrier with minor damage modes. This chapter describes each 3. Submit an interim report that, as a minimum, includes the of the three evaluation approaches, i.e., pendulum testing, following: full scale crash testing, and computational modeling. Chap- The results of Tasks 1 and 2 with a discussion of the crit- ters 414 present the results of the evaluation of the crash ical findings. performance of longitudinal barriers with minor damage A discussion of the objective criteria, to be developed, and the recommended repair criteria and the rationale for for quantifying damage and deterioration related to each criterion. Chapter 15 presents a summary of the rec- barrier performance. ommended repair guidelines. Finally, Chapter 16 presents An updated, detailed work plan, including the research the final product--a "Field Guide for Criteria for Restoration approach and costs to evaluate each damage and deteri- of Longitudinal Barriers." A comprehensive set of appendices oration type identified in Task 2. are provided which include all test reports and a detailed report A preliminary draft outline of the proposed guidelines. on the finite element simulations.