The Tune-Up Tower is a 3 level structure with parking on the first 2 levels and a Dyno-Meter on the top floor. This rolling treadmill is activated by a white switch on the tower roof. The Dyno-Meter measures spinning wheel resistence and wheel alignment. If a wheel is bent to the left then the car drifts to the left. It makes sense that a car pushing into the sidewall of the track will encounter greater friction and run slower.