ICE NOTES CREWSee gravel cars.
IMPACT GUNThe machine used to remove wheel nuts. Also an air wrench or air gun.
IMSThe Indianapolis Motor Speedway. Also referred to as the Brickyard.
IMSAThe International Motor Sports Association. The North American road racing sanctioning body featuring prototype GTS sports car series.
INFIELDEnclosed portion of a track, which includes team garages on most oval tracks. During race weekends, this area is usually filled with large transporters; merchandise trailers, and driver and fan motorhomes.