I got caught in a huge traffic jam about 2 years ago in a little town in TX, and couldn't figure out why everyone was just stopped. I'm glad I didn't get angry or do something dumb like driving on the shoulder, because then I noticed that the cross street was lined with people holding flags. About 10 minutes later, the escort arrived and it lasted another 15 minutes after that. I'm "in the business" and have sees this happen far too often during my career, but it was still an amazing thing to see.