code: public static void setPreferredRoadBorderSize(Integer size) {
  		final Preferences prefs = Preferences.userNodeForPackage(RoadNetworkLayerConstants.class);
  		if (prefs != null) {
  			if (size == null || size.intValue() == DEFAULT_BORDER_SIZE) {
  				prefs.remove("ROAD_BORDER_SIZE"); //$NON-NLS-1$
  			} else {
  				prefs.putInt("ROAD_BORDER_SIZE", size.intValue()); //$NON-NLS-1$
  			}
  			try {
  				prefs.flush();
  			} catch (BackingStoreException exception) {
  				//
  			}
  		}
  	}
docs: Set the preferred size of the roazd borders (in pixels).
  
  @param size is the preferred size of the roazd borders (in pixels).