Pickup truck racing is a form of auto racing which involves modified versions of pickup trucks on racing circuits, mostly oval tracks. Race pickup trucks are mechanically similar to coupé-shaped stock cars, with the main difference being the more boxy shape of the cab, which does not have as good aerodynamics as stock cars. NASCAR Truck Series vehicles have been rapidly evolving since the inception of the series in 1995, in terms of speed, aerodynamics, and engine equipment. The NASCAR series was also the first to use this type of vehicle, unveiled in 1994.