The Minimization of Variables in Equipment and Techniques for Performing Skid Trailer Tests

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Abstract
A development program to improve equipment and field-testing techniques where skid trailers are involved has included revisions of the Tennessee trailer and changes in testing procedures. This paper discusses (1) a reliable technique for measuring the pavementtire forces during skidding of a trailer test wheel, (2) equipment for controlling the quantity of water at the pavement-tire interface and for recording test vehicle speed, and (3) a procedure for evaluating tires so that test tires of different composition may be interchanged. Tire pressure is shown not to be important, whereas tire hardness materially influences measured coefficient. A procedure for recording longitudinal position of the test trailer is well suited for the torque type force-measuring system and is useful for long-term studies involving periodic measurements of friction on the same roadway surface.

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