It could also be that visitors that want to come in will simply do so once they see any vehicle come out, so maybe prudent?
(The vehicles that come out are not just tourists.)
That is more or less what happened during the "Batlle of Crocodile Bridge" on free entry day last year.
Please check Needs Attention pre-booking: https://africawild-forum.com/viewtopic.php?f=322&t=596