There’s nothing more frustrating on a road trip then getting stuck behind a slow-moving bus or truck that you are unable to pass. Not only are they holding you up, but after a few miles (or worse, a few hours), you simply just get sick of seeing the exact same vehicle in front of you. The only saving grace is if, when you finally do get to pass, the driver of that massive vehicle honks the horn and waves.
I suppose the scenery made being stuck behind a bus slightly more tolerable for Flickr user Michael in TN, who took this photo in beautiful Denali National Park. Still, I have a sneaking suspicion he passed that bus the first chance he got.