When the road is wet, your tires will often make less contact with the road surface. In extreme cases, your vehicle may "hydroplane," or actually glide on top of the water. Hydroplaning can drastically reduce your ability to control your vehicle. The tread patterns on tires are designed to channel water away from the tire surface. However, the effectiveness of the patterns can be reduced dramatically as vehicle speed increases. The best way to guard against the dangers of hydroplaning is to adjust your driving speed to the weather and road conditions.