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Meter Built Inc. has developed the 'Communicar' prototype which will aim to create a public-private transportation hybrid. These charming orange cabs link together at their bumpers to form a caterpillar-like train that can run through the city rail-free.

Fuel consumption is reduced with this technology when multiple cars are joined together. Further, many more different routes are available to the 'Communicar,' as each one is designed with individual driving capabilities.