I just saw a late model Blazer kiss some highway barrier walls. I was going about 65mph and the guy was pulling away about 50 yards in front of me. He was tailgating a big rig and then I saw him start to swerve a bit. Next thing I see is him broadsiding the right concrete barrier, then he swerved hard and hit the left barrier head-on. The body roll on both swerves was incredible. I pulled over to check on the guy. He was OK and already calling 911. We were both amazed that his airbags didn't go off. I guess he didn't hit the left wall with as much velocity as it looked like to me. Both front tires were shredded and the guy claimed to have no idea why he lost control.