Some years ago, I was rolling along I-75 heading home from a client and suddenly an entire retread popped out from under the truck ahead of me. It was perfectly crosswise in the lane and I had no chance to avoid it. I hit it square, felt it flip up and strike the underside of my 323, and felt the car jump as the rear tires ran over it. I looked in the rear view mirror and saw it smack the car behind me right in the grill, taking the grill and both headlights out. He didn't lose control, but I saw it fall under his car, so I can only imagine the damage the **** thing did after that.