The four cars board at the same station and are dispatched at the same time. I imagine there could be a beginning half where the karts are automatically guided into the Mushroom Kingdom, and a Mario AA greets them. He could bring them to a Mario Kart training course, with small sections where the driver(s) can test driving and the item handlers can practice shooting items. Then he guides you to the stadium, where other Mario characters greet you and you can join their "team". For example, you can join "Team Mario" and a little M symbol appears on your kart, or "Team Bowser" and a little Bowser symbol appears on your kart. Then, you reach the point where the big race begins. Mario reminds you to get ready, and then Latiku (the cloud guy who starts races in Mario Kart games) counts off the race. The race probably wouldn't go any faster then the Tomorrowland Speedway, and would take place in a Mario Circuit-esque course. Rather it is inside our outside, I don't know. After the race, you see a Mario AA congratulating all the racers, and he presents a trophy with the winner's emblem to the winner. Then you move on to unboarding, and the gift shop after the ride features Mario Kart merch, including real versions of the trophies you win in the ride, and a "highlight reel" of your real life Mario Kart race, which is filmed by cameras out on the racetrack.