stop_area_group relations are a weak point of subway layer in OSM: they are laborious and not mandatory to create, their deletion/breakage often occurs unnoticed. The validator should give a warning/notice if there are two close stop_areas that do not belong to one stop_area_group.
stop_area_grouprelations are a weak point of subway layer in OSM: they are laborious and not mandatory to create, their deletion/breakage often occurs unnoticed. The validator should give a warning/notice if there are two closestop_areas that do not belong to onestop_area_group.