To drive one, a consumer would swipe a credit card, remove a car from the rack, then deposit it at another rack across town when finished.

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Here's an off-the-rack sports car with lateral adhesion in the range of 1 g, a car that hits 60 mph in 4 seconds (the 394-horsepower Carrera S with the dual-clutch PDK gearbox), a car that trips the trap lights in about 12 seconds and decelerates from 60 mph to 0 in about 100 feet.

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"A lot of New Mexicans said this is going to be Richardson's folly... we like to drive our pick-ups, we like to drive fast, we like to drive along with our rifles in the rack at the back of the car, and what's happened is everyone's realised that the Rail Runner has been a blessing because it gets people to where they're going quicker, " he says.

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It's a stackable, lightweight (1, 000 pounds) electric car that can be checked out from a curbside rack, like a luggage cart at the airport, then returned later to any rack around the city.

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It also benefits from excellent rack-and-pinion steering--again, fine-tuned for this car--that's on the lighter side of sporty.

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