Evaluation of surface friction guidelines for Washington State highways. PDF
Preview Evaluation of surface friction guidelines for Washington State highways.
OUDLEYKNOXLIBRARY NAVALPOSTGRADUATESCHOOl MONTEREY CA 93943-5101 FinalReport AgreementT9233,Task 1, Subtask8 TRAC SpecialProjects EVALUATION OF SURFACE FRICTION GUIDELINES FOR WASHINGTON STATE HIGHWAYS by PatriciaCorsello LT,CEC,USN UniversityofWashington WashingtonStateTransportationCenter(TRAC) UniversityofWashington,JD-10 The UniversityDistrictBuilding,Suite 535 1107N.E.45thSt. Seattle,Washington 98105-4631 Washington State DepartmentofTransportation Technical Monitor NewtJackson PavementandSoilsEngineer,WSDOT Preparedfor Washington StateTransportation Commission DepartmentofTransportation October 1993 DUDtiYKNOXLIBRARY NAVAL POSTGRADUATESCHOOl MGNTiflgY CA 93943-5101 ABSTRACT The Washington State Department ofTransportation (WSDOT) determines wet- pavement surface friction characteristics by conducting skid-tests in accordance with American Society forTesting and Materials (ASTM) Method E-274. The results ofthe skid-tests, Friction Number (FN), are used as one of several variables in programming safetyimprovements. This report examines literature from the United States and abroad on friction number guidelines forhighways. On the basis ofan analysis ofthe literature, arevised friction number guideline was developed. The new guideline is consistent with other highway departments that have recently reviewed their minimum friction number guidelines. Most importantly, the new guideline provides WSDOTpavementengineers witharealisticparameterforassessmentofhighwaypavements.
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