The report describes an effort by the Kentucky Department of Highways to develop a standard skid test, utilizing an automobile instrumented to record the characteristics of various parameters associated with a vehicle in skid. The major parameters studied were time, distance, velocity and deceleration. In addition, information was obtained on time of wheel-lock, brake-pedal application and the instant the brake-light was energized. Skid resistance values were determined for twenty-five different combinations of the parameters and their levels. These values were grouped into three categories; namely, velocity and distance, velocity and time and deceleration. Major conclusions drawn from the study are as follows: (1) Measuring time and velocity of a skidding automobile fulfills the requirements of an interim standard method of testing. (2) The use of an automobile as a regular pavement-slipperiness testing device is extremely unsatisfactory in terms of time, expense and hazard. (3) Air resistance and vehicle dynamics have negligible effects on skid resistance. Much remains to be learned concerning the variation of skid resistance with season, temperature and pavement washing. (Author)
Skid Testing with an Automobile
1966
71 pages
Report
No indication
English
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