The rules for tornado safety change if you encounter one while you're in your vehicle. It's important to know ahead of time what you should do because you're not going to have a lot of time to think about it if it happens. If you spot a tornado while driving, you need to stop the car and get out. It may sound counterintuitive, but your car is no match for a tornado. Your car can't outrun it, and there's no safe place to hide in it. Look for the closest low area of ground -- a ditch or the bottom of the hill. Lie flat, cover your head and wait for the tornado to pass.