Based on an Italian design, the BMW Isetta was the largest selling car to ever sport just a single door. As described by Wikipedia, the entire front of the car, including the steering wheel and instrument panel, was hinged to swing outward to provide access for the driver and a passenger. In the event of an accident, they were to climb through the canvas sunroof. BMW started building conventional cars in 1959, and the Isetta was consigned to history three years later after 161,728 had been built.
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