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AASHTO analysis analyze applications approved areas asphalt Asphaltic Concrete assess associated Completed—Published as NCHRP Completed—Report not publ Completion Date concrete contract costs criteria determine develop Effective Date engineering environmental evaluate existing factors Federal Highway Administration FHWA final report following tasks Funds Guide guidelines highway agencies Highway Bridges Highway Capacity Manual impact implementation improvements interim report levels load LRFD maintenance Management manual materials ment methodology methods models NCHRP Project NCHRP Report needed objective operations pavement performance Phase practices Principal Invest problems procedures Progress Through 1988 Proj project panel Published as NCHRP recommended Report not publ Research Agency Research in progress revised roadside roadway safety SHRP silica fume specifications steel structures Submit Summary of Progress techniques technologies tion Topic traffic control Traffic Signal transportation agencies transportation planning Transportation Research Board vehicle