The beauty about sledding "snowmobiling" is that the existing path of snow and ice is enough to travel on. If it is a proper analogy, it is an additive rather than subtractive technology in that you do not have to plow or snowblow the road you are riding on as is the case with most vehicles. As long as there is enough snow or ice, you have your road. It is also--within reason--possible to choose your own route: you are the cowboy or outlaw of the snowy, white 'wastes' in which you travel in a grey zone in and out of officialdom: going on the marked/allowed trails and forging your own path. The winter landscape is your pallette.