Had my first big scare since I started riding again three weeks ago. Tonight I was going for a ride around the local area. First night in about two weeks that the temp has come down to something real enjoyable - 70 degrees. I was riding some back roads around Anaheim Hills and then got on the freeway. I had only been on for about 2 mins, going about 70 when I almost hit a large piece of big-rig trucker tire tread that had detached. It was black the same shade as the pavement and I did not see it until I was on top of it. It stood up on end about 15 inches. Missed it by millimeters, my right peg scraped it. It was a whole tire length bunched up. I can only imagine what would have happened it I had hit it dead on. Took awhile to calm down. At first I just wanted to head on home but I continued riding for about another hour reminding myself why I was on the bike. Thanks for reading.