There are some crazy stories here!
I was on a 4000 mile road trip on my XJ750RJ back in college, and had a few "pucker" situations. The first was in a construction zone doing 70 or so in jam-packed traffic with jersey barriers on either side. The semi in front of me flicked up a large chunk of iron (a good pound or so), and I couldn't avoid it. I moved to the side, but it still clipped my boot. Luckily i was wearing steel-toed boots.
Not long after that, another tractor-trailer shredded a tire in front of me with pieces raining down all around. I split to the side of the road, and zipped along the shoulder until the downpour ended. In both cases I had no choice but to ride behind the tractor-trailers.
The last incident was by and far the scariest. It had just rained on fresh blacktop, it was dark out, and the headlight on my bike was terrible. I was still in Texas (as I was for the first two incidents), and traffic was doing about 80/85. I looked over at something to my right, then noticed a lump in front of me in my peripheral vision. I looked back up, but couldn't tell what it was. Then, I hit it. It was damn near an entire tread from a tractor trailer. From what I remember, it still had complete connection around it in some places. The whole lump was about 10 inches tall, and I smacked it solid. The bike bumped up, and I heard a little noise start as an exhaust pipe came loose, but nothing else happened. I pulled over, checked the bike out, saw another car pull over with his front end hanging off after hitting the same tread, and I decided to ride on.
Texas is/was the worst motorcycle driving I have ever done. Hot, humid, loads of dead animals in the road, and the tractor-trailers loose their tread awful quick in that heat!
Camelman