Waking up to a thick covering of snow is most racers idea of a nightmare, but for a rare breed of petrol heads there's nothing they love more than putting their skills to the test in the trickiest of conditions. So in honour of those who refuse to take the sensible option, and race on whatever the weather throws at them here's a look at five manic motor sports that wouldn't be the same without a bit of snow and ice. Ice karting   Kart races are can take place on almost any surface but one of the most unusual and difficult to drive on has to be ice. The karts are specially adapted to excel on the ice and are fitted with