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Walking Trail (WT) or Footpath is one of the non-drivable Road types. Only add them if it leads to a destination that is important for drivers that is not reachable by a drivable road, or if it is important for orientation.
Due to the import a few years ago, there are still many Walking Trails in the map. Generally, these are unpaved roads. Check the last editor and discuss your ideas. If there is no editor listed, check if they can be used to drive. If so, replace them by the correct road type (often Unpaved). If there is no special reason, they can be removed. In case of doubt, please discuss with the Area Manager or one of the Local Champs.