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AASHO Road Test AASHTO analysis application approved areas Asphaltic Concrete assess associated Bridge Decks Completed Completed Completed Completed—Published as NCHRP Completed—Rep Completed—Report not publ Completion Date Concrete Bridge congestion contract costs criteria detailed determine develop Effective Date engineers equipment Evaluation existing factors fatigue FHWA field following tasks Freeway Funds geosynthetics guidelines highway agencies Highway Bridges highway maintenance identify impact implementation improvements interim report levels Management manual materials ment methods models NCHRP project panel NCHRP Report needed objective operations performance Phase practices Principal Invest problems procedures Progress Through 1988 Proj Published as NCHRP recommended Research Agency Research in progress research plan retroreflectivity revised roadway safety selected Steel Bridges strategies Structures submitted Summary of Progress techniques technologies Texas tion Topic traffic control Traffic Signal Transportation Research Board Urban vehicle Weathering Steel Welded