Abstract: In a method for detecting a hydroplaning risk for vehicle tires the sequential deformations of tread elements of the vehicle tire in the circumferential direction during contacting the road surface are measured. A sequence of corresponding signals is generated. The sequence of corresponding signals is processed to produce processed signals. The processed signals are compared to predetermined evaluation standards, and a warning signal for indicating the imminent danger of hydroplaning is sent as a function of the predetermined standards.

Abstract: A device for blocking the starting of a vehicle engine equipped with an electric starter, in which the engine transmission includes at least one speed range shift lever and at least one group shift lever which levers are respectively guided in two gear shifting gates arranged along about the same plane. The speed range shift lever slots and the group shift lever slots extend substantially at a right angle to neutral control slots which latter extend in one and the same direction. There is provided a shift plate which covers both gear shifting gates and slot-shaped openings exist therewith for the passage of the two shift levers. These slot-shaped openings extend in the longitudinal direction of and at least over the length of the neutral control slots. The shift plate has a bearing which is shiftable about a vertical axis and the pivot pin of which bearing is journalled in an oblong opening extending transverse to said neutral control slots.