Again that contrasts with what I am used to. Here, I’d generally expect prohibitions on cycling or horse rising to be signed. Coincidentally, very near the photos I posted earlier, there is a separate path through a nature reserve, where prohibitions on cycling, scooters, and horses are signed explicitly. Whereas I’ve seen areas defined as “Parque Forestal” or “Monte Público” that post general prohibitions on motor vehicles, so that any unsigned paths are by default “not prohibited” for walking, cycling, or riding, and may well be mapped as highway=path without tags.