Definition: Understeer, also known as a "wiper" or "rudderless," is an unusual condition in which a vehicle's steering system becomes unstable and uncontrollable. This condition can occur when there are issues with the sway arm, suspension, or even other components of the vehicle's overall structure. Understeering occurs when the vehicle's steering mechanism fails to produce any response at all, resulting in a loss of control over the vehicle's direction. When an understeer occurs, the