The safety mechanism is a seat belt and a bar that comes down to hold on.
If the child is small, there is a belt in the middle of the seat with a loop that the seat belt goes thru, which makes it hard for a child to wiggle out.
If you don't have a kid who meets the height requirement, get there early in the morning, and you might get a ride. Plus this one doesn't have FOTL, so it really applies to everyone who wants to try it.
One time, the Thrillnetwork.com message board had a meeting, and we did Hulk a couple times, Spiderman, Dr. Doom, then headed to PF and the guard let us pass. But I woudn't count on that during the summer months.