code: @Pure
  	public static double getPreferredRoadConnectionDistance() {
  		final Preferences prefs = Preferences.userNodeForPackage(RoadNetworkConstants.class);
  		if (prefs != null) {
  			return prefs.getDouble("ROAD_CONNECTION_DISTANCE", DEFAULT_ROAD_CONNECTION_DISTANCE); //$NON-NLS-1$
  		}
  		return DEFAULT_ROAD_CONNECTION_DISTANCE;
  	}
docs: Replies the preferred distance below which roads may be connected.
  
  @return the preferred distance (in meters) below which roads may be connected.