code: public static void setPreferredLaneWidth(double width) {
  		final Preferences prefs = Preferences.userNodeForPackage(RoadNetworkConstants.class);
  		if (prefs != null) {
  			if (width <= 0) {
  				prefs.remove("LANE_WIDTH"); //$NON-NLS-1$
  			} else {
  				prefs.putDouble("LANE_WIDTH", width); //$NON-NLS-1$
  			}
  		}
  	}
docs: Set the preferred width of a lane for a road segment.
  
  @param width is the preferred width of a lane for a road segment, in meters.
  @see #DEFAULT_LANE_WIDTH