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AASHTO analysis analyze applications approved areas asphalt Asphaltic Concrete assess associated CompletedóPublished as NCHRP CompletedóReport not publ Completion Date concrete contract costs criteria detailed 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 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 Research Agency Research in progress Research Results Digest 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