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The measurement of the skid resistance of highways, under wet weather conditions, is part of the Federal Highway Administration (FHWA) skid-accident reduction program. A national reference system and regional reference systems are operated to improve the method of measurement, to reduce differences in results between systems and to include measurement assurance in the program. State highway measuring systems are intercompared with reference systems at FHWA regional field test centers. The document describes the objectives, the scope and the general procedures of the tests used to intercompare the regional reference systems with the national reference system operated by the National Bureau of Standards. Listings of the general equipment required are included.