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Phoenix International Raceway Tunnel Phoenix, AZ

Race crews and fans have easy access to the infield and track at Phoenix International Raceway thanks to a 230 foot long tunnel constructed beneath the NASCAR track. The tunnel passes under turn 4 and is large enough for two semi trucks to drive through side-by-side with room to spare. Wright Engineers provided the structural design using FE analysis of soil-structure interaction which models the soil as an integral structural component.