I saw a neat documentary on CBC last night about how MIT is trying to find a solution to traffic problems, and future cars...
They are designing a similar thing to this - a small, folding car which can be "stacked" in a line up.
Tonnes of these cars are available to the public with access via a credit card - on a pay per use basis.
You walk up to the stack, hop in, pay, and then when you're done with the car, you park it at another stack.
Neat idea.