What function is lost in a skid?

In a skid, the primary function that is compromised is steering. This occurs because when a vehicle skids, the tires lose traction with the road surface, resulting in a loss of control. Without adequate grip, the driver's ability to direct the vehicle is severely hindered, making it difficult to steer effectively in the desired direction.

When a vehicle is skidding, it either slides forward or sideways, and the driver may find that turning the steering wheel does not result in any change in the trajectory of the vehicle. This situation is often exacerbated by factors such as speed, road conditions, and the vehicle's weight distribution, further diminishing the driver's control over steering.

Braking, acceleration, and gear shifting can still function during a skid, although they may be less effective due to the loss of traction. For instance, a driver can still apply brakes while skidding, but the vehicle may not stop as intended. Hence, the essential aspect lost during a skid is the ability to steer the vehicle effectively.