When tires are not even, the car is not stable on the highway, or when it does not feel normal when the vehicle is pushing, then the wheel alignment to the tire should be checked. Start by checking on improper filling of tires and other possible issues that could cause such like worn out suspension and steering parts, damage to tires during accidents, or unmatched tires. All worn or damaged sections will have to be replaced before the capability of proper alignment can take place. The process of aligning the wheels is very costly and requires accuracy in adjustment hence it should be done by an expert at an appropriate workshop. The adjustable alignment angles, which influence the vehicle handling, are caster, camber and toe. The caster angle is considered the side view; positive caster is said to improve the self-centering and directional ability of the vehicle, whereas, over positive caster is said to make steering hard and asymmetry of caster can lead to pulling of the vehicle towards a certain direction. Caster can be affected by factors, such as vehicle overload or sagging rear springs. The tilt of the top of the wheels is known as camber, viewed so as to be negative; negative camber enhances tire contact in turns, but extreme negative camber may decrease straight-line stability and boost bump and torque steer. The angle of the toes as viewed overhead is the distance between the front and back of the wheels; toed in wheels (negative toe) have the potential to improve directional stability and give the highway ride a smoother ride.