Found this story on NPR. Thought it was interesting enough to post here.
From NPR Story:
If you've ever taken a road trip -- or if you've ever been in a car, for that matter -- you've probably found yourself glancing curiously at passersby. Sometimes there's the awkward, accidental eye contact. Sometimes there's the unexpected: a woman curling her eyelashes, a man eating a bowl of cereal, or someone changing outfits behind the wheel. It's interesting that, only when alone in a car, do people sing really loud, as if completely alone and unseen.
Here is a link to Andrew Bush's site: