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A pit stop is the process during a race that the team uses to service their racecars and make adjustments in performance. Fuel is added, tires are changed and small modifications are done, all between 13-15 seconds. The number of pit stops that take place during a race are based on factors such as race length, the number of caution periods, tire wear and fuel mileage. A pit stop can be used as race strategy as well. A crew chief can elect to keep his car out on the track while most others are pitting in order to gain valuable track position in hopes that a caution flag will wave soon or that his cars' fuel or tires can make it to the end of the race.