docs: @Pure
  	public static String getPreferredAttributeNameForRoadNumber() {
  		final Preferences prefs = Preferences.userNodeForPackage(RoadNetworkConstants.class);
  		if (prefs != null) {
  			return prefs.get("ROAD_NUMBER_ATTR_NAME", DEFAULT_ATTR_ROAD_NUMBER); //$NON-NLS-1$
  		}
  		return DEFAULT_ATTR_ROAD_NUMBER;
  	}