Go ahead and pass them, Cherrypicker. But be careful mentioning it here on BF. When I mentioned passing cars on my commute, the BF self-righteous called me a dick and told me I was making it worse for other cyclists by not "waiting my turn" in the car-induced congestion and eating their exhaust: http://www.bikeforums.net/showthread.php?p=6933692
Some pretty funny stuff there