The first thing you want to do is slow down, regardless of what the speed limit is. Ice and snow reduce traction, and this leaves your tires unable to grip the road. This puts you at a greater risk of sliding – and crashing.
You also want to make sure to begin slowing down well in advance of when you need to come to a complete stop. Hitting your brakes too soon could also cause your vehicle to go into a slide.
When you are driving in an area with hills, you do not want to accelerate as you are going up the hill. This will just cause your tires to spin. Try gaining speed before you begin the ascent.