Fluid motion is the basis for trouble-free driving in winter terrain. The car’s inertia and its momentum will keep it moving over most types of terrain. On the contrary, every time the car stops it runs the risk of not getting it moving again. This doesn’t mean, of course, that every stop is pointless. It’s definitely safer to stop on a straight stretch and go check out the difficult passage ahead than to be forced to stop in the middle of a steep hill.