Wheel slip describes what happens when tires lose traction on a low-friction surface. Wheels that have slipped will just spin on the road surface, and drivers will have no control over the vehicle until the wheels regain traction. Wheel slip occurs when the total amount of torque produced by the engine exceeds the total amount of traction available on the road. The less traction available on the road, the lower the wheel slip threshold. This is why it is important to slow down in inclement weather or when road conditions are poor.