When building a city that has an area entirely enclosed by facilities (such as walls), players may make use of the Gate facility to allow transit from the enclosed area to the outer area. Gates may be accessed normally as any other facility, but behave specially when set "Open to All".
Gates set "Open to All" will allow ground travel pathing as if the facility did not exist. Essentially, players, NPCs, vehicles, or other entities making use of ground travel that is normally impeded by the existence of a facility will be able to walk over the Gate as if it did not exist.
Aborting travel while on top of a Gate will move the entity one step backward in their travel path.