In split-axle designs, the wheel on each side is attached to a separate shaft. Modern passenger cars have split-drive axles. In some designs, this allows independent suspension of the left and right wheels, and therefore a smoother ride. Even when the suspension is not independent, split axles permit the use of a differential, allowing the left and right drive wheels to be driven at different speeds as the automobile turns, improving traction and extending tire life.
in split-axle designs the wheel on each side is attached to a separate shaft modern passenger cars have split-drive axles in some designs this allows independent suspension of the left and right wheels and therefore a smoother ride even when the suspension is not independent split axles permit the use of a differential allowing the left and right drive wheels to be driven at different speeds as the automobile turns improving traction and extending tire life