The first car, an open-topped Ford tourer sporting flags and bunting, traversed it in 1913.
BBC: Journey into the Alaskan wild
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In the luxury grand tourer segment, Bentley's redesigned Flying Spur will face competition from Rolls-Royce, which is unveiling its ultra-powerful and rather butch-looking Wraith.
BBC: Geneva motor show: Luxury and recession
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Opel has said it will end car production at its Bochum manufacturing plant in Germany in 2016 after production of its Zafira Tourer car ends.