A few days ago, I was in the area of Tomorrowland Speedway shortly after the Magic Kingdom opened. It was interesting to see how they brought the cars onto the track at the beginning of the day. They start with just a few cars stationed in the first lane waiting for guests. Cast members slowly drive more cars into position as guests continue to arrive. It typically takes several hours before all the cars in all four lanes are up and running. This picture shows how the cars are "staged" at opening time.