I have been driving truck for 35 years now, and today I witnessed something which was amazing. I was on Interstate 5 just north of the LA region, headed southbound. There, flying about 6-8 feet above the highway was a flock of about 10 racers. I was going almost the identical speed, (55), and got to watch them fly for about 3 miles. It was absolutely stunning. They were so close as they darted occassionaly, that I thought they might hit one of the cars. They were only about 100 feet in front of me. All I can say is WOW!!!!