The steering system works by using a steering box to turn rotational motion into linear motion. The steering box pushes or pulls bars called tie rods that are connected to the wheels. Some systems use a rod called a Pitman arms as an intermediate links between the two to change the leverage ratio. The movement of the tie rods and the steering box combine to turn the wheels of the vehicle and allow the vehicle to travel in motion other than straight lines. The alignment of the steering system is critical for proper handling and tire wear. It is an often-overlooked part of normal vehicle maintenance.