Formula One cars are the fastest regulated road-course racing cars in the world, owing to very high cornering speeds achieved through the generation of large amounts of aerodynamic downforce. The cars underwent major changes in 2017, allowing wider front and rear wings, and wider tyres, resulting in peak cornering forces near 6.5 lateral g and top speeds of up to approximately . the hybrid engines are limited in performance to a maximum of 15,000 rpm; the cars are very dependent on electronics and aerodynamics, suspension and tyres. Traction control, launch control, and automatic shifting, plus other electronic driving aids, have been banned since 2004 and 2008, respectively.