We used it in a different way on a different ride. When we were there a couple of weeks ago I didn't think I should ride the cars at Tomorrowland Speedway since I'm pregnant. I just had this fear of somebody plowing me from behind. Both of the kids wanted to drive though. We went through the line, and when we got to the CM who assigns you to your car we explained the situation. He put a white wrap around "flag" on the roll bar to signal that they would get to ride again. Hubby rode with our son driving, and then they switched to let our daughter drive. It worked out great!
Great tip Shannon! Thanks a bunch!