A typical open-wheeler has a small cockpit. It is only large enough for the driver's body. The head is exposed to the air. In modern cars the engine is often located directly behind the driver, and drives the rear wheels. Depending on the rules of the class, many types of open-wheelers have spoilers or wings. They are very low and have an almost flat bottom. These help add aerodynamic downforce. This pushes the car on to the road and makes it handle better.