What should you anticipate when you transport a load on the roof of your car?

When you carry a load on the roof of your car, all three effects listed in the answers apply. First, your car will tilt more in turns because the center of gravity is higher, making it less stable in curves. Second, the car becomes more sensitive to sidewinds since the roof load increases the surface area and shifts the weight upwards, making it easier for wind to affect your driving. Third, the load increases air resistance, which means your car will use more fuel. In general, always drive more carefully and be aware of these risks when using a roof load.