Friction is very relevant when driving a car. For example the weather can change the amount of friction on the road. If it is a clear sunny day friction will be there the most because nothing else is between the tires of your vehicle and the road. As soon as it starts to rain the amount of friction decreases. Rain while it only decreases friction by a little bit can cause slipping. Ice on the road can be very dangerous. Ice fills the tiny bumps and makes the road a smooth surface. Since the surface is so smooth friction is very little. Slipping can occur very easily making the roads pretty hazardous during the winter time. So in the winter when it's snowing and the roads are icy, DRIVE WITH CAUTION!!!!!