ANSWER · B
ABS is the anti-lock braking system, which ensures the wheels do not lock up during emergency braking, thus maintaining steering ability. The ABS anti-lock braking system is a safety brake control system with anti-skid and anti-lock advantages. Vehicles without ABS, in an emergency, cannot brake step by step in time and can only press the brake pedal all the way down. The wheels are then prone to locking up, and combined with the vehicle's forward inertia, this can cause dangerous situations such as side slip, deviation, and loss of direction. With ABS, when the wheels are about to reach the next lockup point, the brake can be applied 60-120 times per second, equivalent to braking and releasing constantly - mechanical "pulse" braking. So ABS prevents loss of direction and wheel slip during emergency braking, prevents the wheels from locking up, keeps the tires from rubbing the ground at one point, increases friction, and achieves a braking efficiency of over 90%.
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