What are the 3 situations of wheel lock-up?

[VanCourtney]

Wheel lock-up can be divided into three situations: skidding, straight-line braking, and sliding. Skidding: When a car brakes sharply at high speed on wet or icy roads, dangerous situations may occur: the rear of the car deviates from the direction of travel during braking, and in severe cases, the car may spin around, losing directional stability. This phenomenon is called skidding. Straight-line braking: During braking, the driver cannot control the direction of the car, meaning the car loses directional controllability. If braking occurs on a curve, the car may slide off the road or into the opposite lane. Even during straight-line braking, the inability to control direction may prevent the driver from avoiding obstacles ahead. Sliding: The movement of the wheels relative to the road surface is no longer rolling but sliding. The lateral friction force and longitudinal braking force exerted by the road surface on the tires become very small. The slipperier the road, the more likely the wheels are to lock up. Additionally, the higher the initial speed of the car during braking, the greater the danger caused by wheel lock-up.