spinout

A spinout occurs when a vehicle loses traction and begins rotating around its vertical axis, so the car's length no longer points in the direction it is moving. The vehicle slides sideways while spinning, typically 90 to 180 degrees or more. This is distinct from a simple skid, where the wheels lock but the car continues moving broadly forward; in a spinout, the car's heading angle separates dramatically from its velocity vector.

Spinouts happen most often on low-friction surfaces: wet asphalt, ice, gravel, or worn pavement. The typical sequence begins with loss of grip at one end of the vehicle, usually the rear axle on rear-wheel-drive cars or the front axle on front-wheel-drive vehicles. Once the rear slides beyond a critical angle, aerodynamic forces and the vehicle's yaw inertia can amplify the rotation faster than the driver can counteract it. On highways, a spinout at speed can place a car sideways across multiple lanes and into the path of following traffic.

Sudden steering input at high speed, especially on low-friction pavement, is a common trigger. Heavy braking while turning can unload the inside tires and induce a spinout. Hydroplaning at highway speeds (typically above 45 mph on standing water) can initiate a spinout because the tire contact patch floats on a water layer. Rear-wheel-drive vehicles are more prone to spinouts under hard acceleration on slippery surfaces. All-wheel-drive systems and electronic stability control (ESC) systems reduce spinout risk by modulating engine power and applying individual wheel brakes to maintain yaw stability.

The term reflects the vehicle's motion: it spins out of the driver's control and out of its normal lane. In racing, a spinout means loss of position and risk of impact with barriers or other cars. In accident investigation, spinout evidence includes curved tire marks, paint transfer patterns that show rotation, and vehicle final rest position that often contradicts the impact vector.

Modern vehicles equipped with ESC can detect the onset of a spinout through yaw rate sensors and inertial measurement units, then automatically apply corrective braking and power management before the driver even feels loss of control. Without such systems, spinout recovery depends on the driver's skill: typically, steering in the direction of the skid, avoiding hard braking, and waiting for traction to return rather than fighting the rotation.