So what. Wouldn't you slow down if you came upon a bunch of people on bicycles on a highway? I agree that it was dumb of them, and of the driver of the vehicle that should have been *trailing* them with emergency lights on.
Things happen real fast on highways like this. People are used to driving 2 and 3 hours at high speed...No stops, no nothing...Then suddenly you get some suicidal people who thought riding their bicycles out there 20mph was a good idea?
Trust me here. Some of the collisions going to and from Vegas area look like aircraft crashes. Not a place to be bicycling.