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63 and FY AASHO Road Test Academy accident aggregates analysis analyzed application areas asphalt asphaltic concrete August 31 beams Bridge Decks characteristics Committee Completed—Published as NCHRP Completed—Report Completion Date concrete conducted Connecticut Turnpike contract Cornell Cornell Aeronautical Laboratory costs criteria Deicing Deicing Agents determine driver economic editorial and publication Effective Date Engineering evaluation existing Factors Influencing February February 15 final report Flexible Pavements freeway Funds guidelines highway departments highway design Highway Research Board Improved included Institute investigated June 30 laboratory lane drop load maintenance materials measure ment methods NCHRP Project NCHRP Report objectives Pavement Performance phase practice predicting Principal Invest problem procedures project report properties proposed published requirements Research Agency Research in progress research results review stage selected slab specific Steel studded tires Summary of Progress survey techniques tion traffic operations types University urban Valuation various vehicle