To assure motion performance of braking, acceleration, and steering by blowing off an immediately preceding part of ground contact surface of a wheel by using high pressure air to bring it to a state of a dry road surface instantaneously in a wet road surface, and to generate a shearing force between a road surface and a wheel by forming recesses and protrusions on a compressed snow surface by using high pressure vapor on a compressed snow road or a frozen road.

High pressure air spray nozzles are jutted out just before the ground contact surface of the wheel as needed to blow off water on the road surface. On a compressed snow road surface, the high pressure air or high pressure vapor is sprayed intermittently to form recesses and protrusions on the compressed snow surface. Furthermore, the high pressure air or vapor is also sprayed on the tread surface of a tire to remove water or snow in a tread groove.

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