( SMI ) is an American corporation that owns and manages racing facilities that host NASCAR , IndyCar Series , NHRA , World of Outlaws and other motor racing series .
Speedway Motorsports , Inc .
( Speedway Motorsports , Inc . ) is an American Speedway Motorsports , Inc . that owns and manages racing facilities that host NASCAR , IndyCar Series , NHRA , World of Outlaws and other motor racing series .
Speedway Motorsports , Inc .