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A trailing car intentionally bumps the car in front of it. The bump sometimes causes the lead car's rear tires to momentarily lose traction. The driver of the lead car is forced to correct his steering, slow down, or at least stop accelerating to regain traction and/or car attitude. The trailing driver positions to pass the leading car before the next corner. Bump and run is often done after coming off a corner. It is much more dangerous when done in the middle of a corner because both cars are already loose. A gentle tap is what is required most of the time. A stronger bump might result in the lead and/or the trailing car spinning out of control, and possibly leading to a multi-car crash.