How to park a smartcart in the city?

How do you park a smart car in the city? Well stack it of course. Researchers at MIT have come up with a prototype called the "City Car."

The City Car is a stack able smart car that seats 2 passengers. The City Car is NOT a replacement for personal transport but is a model that is similar to the grocery cart stack or luggage carts at the airport. The hope is that this vehicle will become more of a socially accepted model of transportation within a densely populated urban environment.

For example, people that live outside of an urban area but drive into work sometimes have an option to park outside the city limits and then take in mass transport to the city centre. the City Car would be able to replace the large city buses or trains that move mass transit into the city centre.

Would this have a positive impact and reduce the carbon footprint of a city? Interesting concept.