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AASHO Road Test AASHTO agency report analysis application approved areas Asphaltic Concrete assess associated capacity characteristics Completed—Published as NCHRP Completed—Report not publ Completion Date congestion contract costs criteria determine develop Effective Date engineering equipment Evaluation existing factors FHWA field following tasks Freeway Funds geosynthetics guidelines highway agencies Highway and Transportation Highway Bridges identify impact implementation improvements interim report intersections levels load 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 Report not publ Research Agency Research in progress results of Tasks retroreflectivity revised roadway safety selected Steel Bridges strategies Structures submitted Summary of Progress techniques technologies tion Topic traffic control Traffic Signal Transportation Research Board Urban vehicle Welded