Bump and run (auto racing)

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Bump and run is a technique used in auto racing where drafting is used. The objective of the bump and run technique is for the follower in a 2-car draft to get ahead of the leader. This is accomplished by physically nudging the rear of the leader's car gently, causing the leader's car to momentarily lose traction. The follower takes advantage of this momentary traction loss to get ahead of the leader. This is a technique used commonly in NASCAR auto racing.

A gentle tap is what is required most of the time. A stronger bump might result in the lead car spinning out of control, and possibly leading to a multi-car crash.