In places where it doesn't snow often (and even in places where it does), many people don't know how to deal with a snowy or icy road. If possible, stay home. It's the surest way to avoid a mishap. If you have to travel, follow the advice given above about NOT overdriving your traction. In short, keep speeds slow and maneuvers very deliberate. If you see snowy and icy roads regularly during the winter, consider getting a set of winter wheels and tires so you can swap to the best tires possible for the conditions.
Here in MN, I wish more people used winter tires. After any big snowstorm, there are always many accidents and spinouts.... many that would be preventable if folks were using tires better-suited to the conditions.