Originally Posted by
Fabrik8
Better still, why do the vertical surfaces on the back of your car get wet when it rains even though in you're going forward?

Forgot about this... Rain falls down. It does not travel over the car then turn and land on the rear as if it were going sideways.If it did then again the whole river thing. The back of the car is a much larger area than the rear of your hood. Air traveling under the car goes up and meets in the middle of the back of your car with the air/water which is being pushed down the rear of your car.