If the weather forecast calls for snow or ice on the roadways, it's best not to drive at all. When driving on snowy roads is necessary, go at half the posted speed. If the roads are icy, drive at a crawl.
It's important for drivers to travel at crawling speeds on icy roads because braking requires at least twice the distance as usual. Slowing to a stop is more difficult at higher speeds. Traveling at a crawl is a preventative safety measure should you need to brake quickly in icy conditions.
The speed at which you can travel safely on ice will depend largely on the size of your vehicle and its weight. A trailer truck filled with cargo will require a greater stopping distance on ice than a sedan with one traveler and an empty trunk. The truck would need to travel at considerably lower speeds than the sedan to be safe on an icy road.
