The ghosts are unable to reverse direction in Pac-Man. You should have your agent read this: https://pacman.holenet.info/

What does it mean for the ghosts to be "unable" to reverse direction? Isn't that just another way of saying that the original ghost AI was programmed to never choose to do so? There are, in fact, a lot of things they never choose to do. The whole appeal of this idea is to see if you can make better decisions than the original ghost AI.