Air flowing over the body of a car produces pressure that can be harnessed for stability. Depending on the design of various parts of the car, the pressure of the air produces either lift or downforce that pins the car to the road.This increases with speed, so engineers use downforce to aid high-speed stability. The wings you see on the front and rear of Formula 1 cars produce the downforce that allows them to take corners at speeds over 250kph. The wings help resist centrifugal forces and are an essential component in keeping the car on the road. Downforce is so strong that, given enough wing and speed, a racing car could theoretically travel upside-down in a circular tunnel!