Found this on MotherProof.  Used in Dublin, Ireland, this modern take on the rickshaw offers up to three people free rides around town.  The EcoCab and the driver’s salary are paid by the advertising wrapped around the back and on the wheel covers.  MotherProof author Emily Hansen speculates that these would be nice for getting kids to school, but I think this (below) is even better because you can cram way more than three kids in there:
Wouldn’t it be fun to bring this picture to the next School Board budget meeting and offer it up with a straight face?