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NASCAR Winston Cup rule book on "pit procedures during race"
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Section 9 - Race Procedure
9-15 Pit Procedures During Race -O. It is the responsibility of each driver to position his/her car within the assigned pit box. It is the responsibility of the crew chief to stop all crew members from working on the car until the car is within its assigned pit box. Each car must stop within the designated lines of its assigned pit box on pit road to be considered "in the box." Unless otherwise authorized by NASCAR, a car is considered "outside the box" if any of the following occur:
(1) The outside front tire of the car is on or over the outside line of the pit box.
(2) The front air dam of the car is on top of or over the line in front of the pit box.
(3) The inside rear tires is on or outside the pit box line.