Today, our team presented on Pac Manhattan. One of the aspects of the game that I found really intriguing was how it navigated safety (not well, in my opinion). There were antidotes about players waited until the last possible moment to cross streets to strategically gain an advantage. In other words, if a ghost decided to run after Pacman, they would be hit by a car.
In Pervasive Games, Montola speaks about using the unpredictability of the external environment to always guarantee a unique experience. Everything in the real world becomes an object that can be manipulated for the purposes of the game. Montola also points out the risks associated with this, however. For instance, players may unethically involve non-players, or in the case of Pac Manhattan, could potentially become dangerous.
I believe Pac Manhattan could easily become dangerous if someone experiences intense tunnel-vision, and the designers did not account for this well. Sure, the players were college students who presumably can handle the situation more rationally than a child, but Pac Manhattan is one of the unique ARGs that can be recreated. It isn’t inconceivable that some kids somewhere may try to play the game amongst each other and get hurt.