Only the rear wheels are driving the car; they are connected to the engine and transmission by a driveshaft. On a front-engined rear-drive car the driveshaft runs the length of the interior, reducing passenger room. Very few cars are rear-wheel drive these days, exceptions are all BMWs, Mercedes-Benzes (except the A-class), Falcons and Commodores, Lexus models IS200, GS300 sports and LS400. In the US only a very few giant models are rear-wheel drive.