Step 3 » GENERAL learning environment Category B (B, B1)

The two types of skids are:

Understeer - is a phenomenon that appears most frequently in the case of motor vehicles with the engine and the driving axle at the front. Because the wheels of the front axle are both steering and driving, an overloading of these occurs while the motor vehicle turns. This phenomenon increases as the traction force (or, as the case may be, the braking force) increases excessively during the turn. In other words, strong acceleration or sudden braking performed during the turn will cause the understeer of the motor vehicle. The consequence of this is the loss of adhesion between the tires and the rolling surface, respectively the motor vehicle entering an uncontrolled trajectory (its skidding).

Oversteer - is another phenomenon likely to lead to the loss of control of the motor vehicle in a turn and consists of a rotation of the motor vehicle around its axis. This is a characteristic specific to motor vehicles with the driving wheels on the rear axle and appears whenever the tires lose adhesion. As in the case of understeer, the phenomenon occurs when the driver brakes strongly during the turn and is strongly accentuated by excessive tire wear or by a slippery carriageway. To understand the phenomenon of oversteer, imagine a transfer of the center of gravity towards the front part of the motor vehicle, simultaneously with the loss of adhesion of the tires on the rear axle.

Therefore, when you perform a left turn at high speed, the motor vehicle has the tendency to skid to the right, towards the outside of the curve. That is why in curves the speed of travel must be preventively reduced.

The correct answer is: A

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