I believe that it permits up to three people, but not sure. I don't think I can explain it better than the PP's. But just make sure that when the first adult goes in y'all ask for the swap slip. I am just saying this, as this last trip there was a husband and child waiting with us at Dinosaur and they had not gotten the baby swap slip. They thought they could just tell the that they were swaping after the first adult went. Not sure how it worked out for them, but the line was currently 1.5 wait.
It is a great option. We have a DS (3.5) that is small and can't ride any ride about 35 inches. The other 2 kids enjoy it since they get to ride twice.