"People who are normally circumspect may, when describing their commutes, be unexpectedly candid in divulging the intimate details of their lives. They have it all worked out, down to the number of minutes it takes them to shave or get stuck at a particular light. But commuting is like sex or sleep: everyone lies. It is said that doctors, when they ask you how much you drink, will take the answer and double it. When a commuter says, 'It’s an hour, door-to-door,' tack on twenty minutes."
Quite reminiscent of "Two-Fisted Tales of Commuting": http://archive.salon.com/comics/boll/1998/06/src/04boll.gif