Excuse me, Mr. Hammond, but I have a question.

If the Jurassic Park tour was supposed to be automated, and they didn't want people to leave the vehicles, why was there a Jurassic Park bathroom on the tour route, and why was it located by the Tyrannosaurus Rex Paddock?

(I could understand if there was a Porta-John there since the park could have still been under construction to a certain extent, but that bathroom was clearly meant for visitors, even though said visitors were clearly not supposed to leave the vehicles during the tour.)