Every morning I ride my bike to a corner in my suburb, lock it up for the day, and usually there are a few cars waiting for people.  I jump in the first one, usually the driver is a stranger.  The casual carpool has been going on in the east bay for 40 years:<p><a href="http:&#x2F;&#x2F;sfcasualcarpool.com&#x2F;" rel="nofollow">http:&#x2F;&#x2F;sfcasualcarpool.com&#x2F;</a>