Post-WWII Euro needed an affordable & short commuter transport, so the Isetta was created. An Italian/German bubble-car imagination became an influential citycar design for the rebuilding urban centers. Here's a recent design grad's design interpretation of that famous icon. The "e"Setta replaces the heart with an electric motor. The design would be part of a ride-sharing system and gets recharged @ induction stations throughout it's operating areas.
Kewl design.
eSetta - Diploma 2012 by Tony Weichselbraun at Coroflot
... I still question it's effectiveness on SoCal freeways.