The concept is simple: put a rope on a car or motorcycle, presumably equipped with studded snow tires, then have the driver navigate a race course at speeds up to 100 miles per hour….

Filmed in Bavaria, Germany 1955.

Source: http://dedeporsche.com/2012/02/09/1955-winter-vintage-porsche-motor-skiing-with-a-twist-the-worlds-most-dangerous-sport/ & The British Pathé Film Archive

90,000 British Pathe reels can be viewed and enjoyed on: http://www.britishpathe.com