A good question! it is not always obvious, especially if the misalignment is slight, but there are signs to look out for:
Why does my car need a Hunter wheel alignment?
Misalignment occurs through day to day driving of a car. As the car ages, components can loosen and suspension parts wear.
Obviously kerbing and hitting a pot hole will affect it dramatically.
Alternatively it may have been wrongly adjusted previously.call in for a check today.