During the winter many lakes freeze enough to drive on, but there are important safety precautions to take. Remember to test the ice before ever trying to drive on it. Use the rule that nothing less than six inches of ice should be driven on by any vehicle. There should be one inch of clear blue ice for every thousand pounds of weight, so know how much your vehicle and its contents weigh. If you are parked that number needs to double and it's recommended that you, "Drill a hole beside each vehicle and watch for water welling up, which is a sign the ice is deflecting downwards." Click the link for more important safety tips.