Don't know the rules but have them be aware of what is coming behind them and that they need to follow the same rules as golf carts and cars stop at stop signs, look before crossing know what is coming behind you. Someone posted in another thread here that a little boy just got hit by a Disney Van yesterday the kid actually darted out of a loop and hit the van I guess he got banged up pretty bad.
I just got back and saw first hand how the kids on the electric scooters dart around without looking one did not even know we were behind him lucky we knew it and we knew he would cross over without looking behind him in which he did.
So just have him be very careful because Disney will put a stop to the scooters if this keeps happening.
Have fun