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The inclusion of automobiles in the Florida skid correlation study was promoted by the recognition of the following needs: 1) to compare stoppingdistance measurements obtained with different instrumentation, 2) to suggest a standard method of stopping-distance testing, 3) to relate skid-resistance measurements of trailer-type testers with stopping distances of automobiles, and 4) to explore other skid-resistance measurements techniques using an automobile. The vehicles were all full-size automobiles. Each vehicle was instrumented to measure a distance from a predetermined pressure in the brake hydraulic system to where the vehicle came to rest. Stopping distance in most of the automobiles was read directly from summating counters. Two of the automobiles were equipped with strip-chart recorders to measure distance, velocity and deceleration during the skid. The measured stopping distances displayed minor differences between automobiles regardless of the instrumentation. The primary cause of variation in the test results was attributed to the ability of the driver to apply brakes at the prescribed test velocity. Lag between brake application and wheel lock and errors in the distance-measurement instrumentation were of secondary con-

Florida Skid Correlation Study of 1967 Skid Testing with Automobiles