About two weeks ago i noticed that my sterring wheel began viberating a little and then would dissapear. Over time this viberation has become more severe and more frequent. I tought it might have been dirt on the wheels. I cleaned all 4 but the viberation comes back. The alignment seem good. Vibratinon seems to be most severe a lower speeds and seem to occure during stop and go excellaration and last for verying lenght of time. The vibration also seems severe when you start from stop and excellerate into a large turn , like turning onto a street from a driveway.
Can anyone tell me the cause of this problem, and is it a safety issue ?