That is when the tread comes off the rest of the tire. This can cause you to lose control of your vehicle and many times results in catastrophic injuries.
One minute you are driving normally, and the next you don’t have any tread on your tire. The tread is what keeps the tire connected to the road, it’s what grips the road. If that is not there, you have little chance of controlling your vehicle.
If you have had a tire separation give us a call.