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To examine the effect of anti-lock brakes with summer, all-season, and winter type tires on ice and snow, tests were carried out on a flooded frozen track and on asphaltic pavement with newly fallen snow. The friction values obtained were compared with those reported by other investigators. The most important factor governing the amount of traction on snow or ice was the temperature of the tire/snow/ice interface at the time of the test. The same tires on the same surface produced twice as much or half as much traction during tests done later after the temperature had changed. Surface roughness was also a significant factor. Overall, decelerations ranged from 0.10 g to 0.30 g. This is consistent with the majority of earlier published data. Directional control was often lost during tests with the anti-lock brake system inactive. Control was never lost during tests with the anti-lock brake system active.