MIT's Stackable, Foldable "City Car"

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Researchers at MIT are building a prototype of a lightweight electric vehicle that can be cheaply mass-produced, rented by commuters under a shared-use business model, and folded and stacked like grocery carts at subway stations or other central sites. It's called the City Car, and the key to the concept lies in the design of its wheels. The MIT team has transformed the lowly wheel into a robotic drive system that will power the City Car. Embedded in each of its four wheels will be an electric motor, steering and braking mechanisms, suspension, and digital controls, all integrated into sealed units that can be snapped on and off. :: Via Boston.Com

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