A study was conducted to evaluate the theoretical and practical aspects of using an automobile as a testing device for measurement of pavement slipperiness. Every parameter and significant event in the excursion history of a skidding automobile was measured and recorded. The resultant skid-resistance values, twenty-five in all, were compared and correlated. As a result of the study, the measurement of time in the velocity increment between 30 mph to 20 mph was selected as an interim standard test. A number of experiments were also conducted to aid in the interpretation of test results and to establish control tolerances for the standard test. The British Portable Tester was further evaluated on various roads common to Kentucky and was found to have limited usefulness.

Report Date


Report Number

No. 264

Digital Object Identifier



For presentation at the 46th Annual meeting of the Highway Research Board Washington, D. c.