The Porsche 918 RSR and the Audi A6 have been honored as the best-designed cars at the North American International Auto Show (NAIAS) as the event prepares to open to the public January 15.

The EyesOn Design Awards are awarded annually to the best concept and production models at the show, with the Porsche 918 RSR picking up the concept prize and the new Audi A6 being judged the best-designed production model.

Porsche's hybrid supercar concept, which uses energy storage to produce an electrical eight-second engine boost comparable to a nitrous oxide burn, beat contenders that included Ford's Vertrek SUV and Kia's KV7 design.

Audi's A6, which will be in showrooms this fall, beat the Bentley Continential GT, BMW 6-Series Convertible, and the Hyundai Veloster to the prize, Audi's fourth EyesOn Design award over the past three years.

Audi's head of exterior design Achim Badstuebner told the audience that the gong "is strong feedback that we have done our homework."

The EyesOn Design prize is sponsored by the Detroit Institute of Ophthalmology and has a judging panel that includes industry experts from companies such as Harley-Davidson and Ford and academics such as the Academy of Art University's Tom Matano.

It is the second major prize to be awarded at NAIAS after the North American Car and Truck of the Year Awards, which were given to the Chevrolet Volt and Ford Explorer respectively.

The North American International Auto Show is open to the public January 15-23 in Detroit, Michigan.

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