Doesn't it stand to reason, because of the pull of gravity, that it would take at least three times the time and distance traveling on a steep downhill roadway to stop than when traveling uphill? These are the same drivers that do this everyday. Why?
One of the reasons is that it's easier to go faster downhill because the driver doesn't have to do anything. The car just goes down the steep grade all by itself. It's nearly impossible, on the other hand, for a driver to maintain his speed uphill as he has to do something that is very difficult; he has to press down on the gas pedal; therefore, he can't catch up to the car in front of him.
By tailgating only: 15,000 killed, 750,000 hospitalized, and 2.7 million accidents yearly in the United States. Keep up the "good" work.