Drivers passing by the enchanted house kept complaining that the ghosts coming from the wall crossed across their vehicles, so the town decided to mark a crossing so the cars could stop and the ghosts could properly cross the street outside other people's cars.
The spokesoul for the ghosts explained that they agreed it was a cleaner solution, so that they no longer had to suffer the stink left on their sheets crossing the tanks and motors. Also, the music playying in some o the cars they crossed wasn't always of the ghosts taste.