Huge megalopolises confront daily with the problem of pollution and traffic congestion. Media Lab researchers proposed City Car design as a way to improve urban mobility. The concept of smart car aims to be pollution-free and easily customized. The City Car is a stackable electric two-passenger city vehicle. It utilizes integrated in-wheel electric motors and suspension systems called “Wheel Robots” that eliminate the need traditional drive train configurations like engine blocks, gear boxes, and differentials. The vehicle can maneuver in tight urban spaces and park by sideways translation.