When your wheels are properly aligned they all point in the same direction. When they are out of alignment, most drivers notice a couple of things. First the vehicle pulls to one side when driving. It could be slight or pretty severe. If your wheels have been out of alignment for a while, you'll also start to see excessive tirewear. Popping and knocking noises along with squeaks are signs of worn front end parts which will cause alignment issues and possible safety concerns. All of these indicators require an immediate alignment inspection. It is a good idea to have your vehicle's alignment check once a year to extend the life of your tires and reduce rolling resistance which will lead to increased fuel economy.