Car 45 right before the accident.
Car 45 is the main cause of the McKinley Speedway disaster. The car stops as the pit crew members start fixing it. As the crew member says go, the car drives off, leaving a screwdriver in place. As the car is driving, the screwdriver drops, drives over Car 6, popping its tires, the car explodes causing a tire to obliterate Nadia's head.