http://blogs.desmoinesregister.com/dmr/index.php/2013/12/16/snow-and-ice-cited-in-nearly-15000-of-damage-on-waukee-roads-last-week/article

Car accidents increase when it snows because when the snow turns to ice there is no friction causing cars to slide on the road regardless of the breaks being applied. The car will continue on (according to newtons first law) until a net force acts upon it. Be careful. 

Sharda Ramjit