If you have a passenger car or even an SUV, you're probably accustomed to ignoring "low overhang" warnings. When you add a load to the top of your automobile, you'll need to pay more attention to these signs, especially if you're carrying a bike. Once you're loaded up, you should measure the exact height and keep a note by the steering wheel. Be sure to keep an eye out for bridges, parking garages, and even wires and tree limbs. And remember that when you make the quick, right-off-the-highway-fast-food-stop, you may need to need to skip the drive-thru and head into the counter.