Abstract: This invention is a control device to vary the contact conditions of the tread of a vehicle to improve driving functions, such as skid prevention, noise reduction, road surface protection or road marking, by the choice of the appropriate trodden tips in given road conditions. The trodden tips and connected parts are unified to make a unit which is attached or detached with a simple connection such as the insertion at a convenient position, which enables the device to function properly with a lowered safety factor, reducing the size only to avoid damages of the device and around.

Abstract: This invention is a control device to vary the contact conditions of the tread of a vehicle to improve driving functions, such as skid prevention, noise reduction, road surface protection or road marking, by the choice of the appropriate trodden tips in given road conditions. The trodden tips and connected parts are unified to make a unit which is attached or detached with a simple connection such as the insertion at a convenient position, which enables the device to function properly with a lowered safety factor, reducing the size only to avoid damages of the device and around.

Abstract: A paving block with a rubber piece made from, e.g., a used tier, for reducing echoes, noise, wear, icing on the block surface, adhering force of ice, shocks in collisions, etc. The block having high dimensional accuracy and comprising strong rubber piece that does not peel away fro a long period is provided by a simple and low-cost method. The method is applied to provide diverse construction blocks to which materials, other than rubber, with various characteristics are attached. A square piece of rubber is cut off from a tire with non-uniform, uneven thickness caused by wear. This piece of rubber is made a surface layer piece (1) of a block, and asphalt that functions as a bonding portion (2) is applied to the back side of the surface layer piece (1). Concrete is placed directly on the asphalt as a curing body (3). The concrete placement thickness is adjusted so that the entire block has a predetermined thickness and the concrete is cured.

Abstract: An anti-skid mechanism for vehicles interposes a series of blades or fins between the wheels and the road surface. The fins are mounted upon a sprocket chain or endless belt which rotates about a pair of sprocket wheels with straight section of the sprocket chain aligned near the contact point of the tire with the road. The fins are consecutively laid upon and removed from the road surface in a straight line between the wheel and the road surface. The flat sprocket chain and its mounting upon the sprocket wheels provides a high degree of stability of movement of the blades which in conjunction with the straight orientation of the chain or belt and attached blades under the wheel maximizes the static coefficient of friction between the wheel and the road.