In the room you spawn in there is one of those directories and on it, it shows the bus routes. There are two separate routes, one that runs during the day and one during the night. I have two possible theories for this, we need to change the time on all the clocks. I think there are 3 on the map and maybe if everyone puts a turbine under them it will change the time. My second theory doesn't have to do with time but a certain sign in the highway. This sign can be interpreted two different ways, one way being it saying during the day cross over 2 me, the other way being to shoot it with the Porters X2 Ray Gun as in the sign is saying "For day shoot me with porter x2." I don't know if any of this is true but I hadn't seen it posted so I thought I would.