Picture a University bldg. shaped to form a slot canyon to provide shaded access to the outdoors. Within the canyon, which includes doors to exit the courtyard, are a few small classroom pods. Does each classroom pod entrance require walk-off mats from the canyon courtyard?
There is also a pod on the roof, accessed directly from internal stairs. But it has an exit door, that may be used for re-entry. We believe re-entry is not "regularly used."