Well, if they're flying over the roads, it's not like they're going to look for a rest stop on their way. I don't think "Daddy, can we pull the flock over? I need to go to the bathroom" works the same way in air.
..Although... just-washed cars could be their rest stops!
I always was told that since the just washed car is shiny, to the eye of a flying bird, it appears similar to a small body of water, and most birds prefer going over water. I have no knowledge as to whether this is an old story, or if it is true.
Part of the enjoyment of being a consumer is that for every three CDs you buy, one of them that you spent $20 on is complete and utter shit. ----The Bloodhound Gang's Jimmy Pop Ali
'They' are the people who make it thier lives work to make sure not one person on God's green earth is ever sad, or alienated, or hurt. They are the people who invented 'time outs', amd other such nonsense. That's right folks, DR.