This was going to be a reply to the
hitchhiking thread, then I thought a new thread might be warranted.
Have you heard of
slugging?
It's an uber-casual form of commuter carpooling. I saw a video the other night, and due to gas prices and congestion in the DC area, folks just line up to jump in a car so that driver can use the carpool lane. Pretty wild.
I wonder if it will/has spread to other areas.