docs: public static void setPreferredAttributeNameForTrafficDirection(String name) {
  		final Preferences prefs = Preferences.userNodeForPackage(RoadNetworkConstants.class);
  		if (prefs != null) {
  			if (name == null || "".equals(name) || DEFAULT_ATTR_TRAFFIC_DIRECTION.equalsIgnoreCase(name)) { //$NON-NLS-1$
  				prefs.remove("TRAFFIC_DIRECTION_ATTR_NAME"); //$NON-NLS-1$
  			} else {
  				prefs.put("TRAFFIC_DIRECTION_ATTR_NAME", name); //$NON-NLS-1$
  			}
  		}
  	}