I have been to one of these events. the driver uses the U shaped plexiglass hand piece to guide the tractor, when the tractors are not in use they use plastic wrap for the rear wheels, they are very sticky and susceptible to dirt, the track is wiped down after every run (alcohol drips) and if the tractor breaks traction when in a pull all hell will break loose.....it will grab, fly in the air & do it all over again in seconds.