This report presents comparative wet traction data on a sample of tires from locked wheel tests run by the Safety Research Laboratory of the National Highway Traffic Safety Administration in order to develop a data base for establishing traction standards. Identical tests were run on three surfaces at the Texas Transportation Institute and on two surfaces at the Uniform Tire Quality Grading Treadwear and Traction Test Facility, Goodfellow Air Force Base. The precision of these results demonstrates the feasibility of (1) using a two‐wheeled skid trailer for locked wheel tire traction grading and (2) constructing surfaces which will remain stable for the purpose of traction testing.

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