Carpooling even when you're not

One of the advantages of being green in a zero emissions car is the fact that the great state of California permits non polluting vehicles access to the carpool lane even when you're alone in the car. The whole concept of the carpool lane was to get more cars off the roads by encouraging carpooling and ultimately decreasing not only the number of cars, but the resulting pollution as well. 

Prior to July 1, 2011, certain hybrid cars like the Prius were also allowed into the carpool lane if they had a special sticker.  This was a temporary incentive by the state to encourage motorists to buy cleaner hybrid cars, but that exemption has now expired, leaving only select pure electric cars like the Mercedes F-Cell, Tesla Roadster, Nissan Leaf and clean burning alternative fuel cars like the natural gas powered Honda Civic as the only cars now allowed in the lanes, other than actual carpooling parties and motorcycles.  

So now with the F-Cell, I'm not only not polluting, but get special access to the carpool lanes drastically cutting the commute time during rush hour.  What's not to like?