A wide variety of technologies—including active suspension and ground effect aerodynamics —are banned under the current regulations. Despite this the current generation of cars can reach speeds in excess of at some circuits. The highest straight line speed recorded during a Grand Prix was , set by Juan Pablo Montoya during the 2005 Italian Grand Prix. A Honda Formula One car, running with minimum downforce on a runway in the Mojave Desert achieved a top speed of in 2006. According to Honda, the car fully met the FIA Formula One regulations. Even with the limitations on aerodynamics, at aerodynamically generated downforce is equal to the weight of the car, and the oft-repeated claim that Formula One cars create enough downforce to "drive on the ceiling", while possible in principle, has never been put to the test. Downforce of 2.5 times the car's weight can be achieved at full speed. The downforce means that the cars can achieve a lateral force with a magnitude of up to 3.5 times that of the force of gravity (3.5g) in cornering. Consequently, the driver's head is pulled sideways with a force equivalent to the weight of 20 kg in corners. Such high lateral forces are enough to make breathing difficult and the drivers need supreme concentration and fitness to maintain their focus for the one to two hours that it takes to complete the race. A high-performance road car like the Enzo Ferrari only achieves around 1g.