Bump and run is a technique for passing mainly used in stock car and touring car racing, which eventually inspired the police PIT maneuver.
While the bump and run maneuver is not uncommonly used in series such as NASCAR, it is dangerous to use in open-wheel racing in general due to the extremely high speeds and relative fragility of open-wheel race cars.
The bump sometimes causes the lead car's rear tires to momentarily lose traction.
The trailing driver positions to pass the leading car before the next corner.
Introduced in 2007, NASCAR's Car of Tomorrow was expected to hinder the effect of bump and run.