I know its a different world legally sometimes, but Kongfrontation this is exactly what happened, only 30 feet in the air. A long Lap Bar with children seated in the middle would be the only restraint that would make sense. That being said, I don't think there is one.
Sea belts would be a capacity nightmare with capacity and operations to get everyone buckled in within a row you can't walk down.
The motions and jolts as said are on platforms similar to Earthquake's original motions. Which if everyone remembers, had no restraints.