code: public static void setPreferredLaneCount(int count) {
  		final Preferences prefs = Preferences.userNodeForPackage(RoadNetworkConstants.class);
  		if (prefs != null) {
  			if (count < 0) {
  				prefs.remove("LANE_COUNT"); //$NON-NLS-1$
  			} else {
  				prefs.putInt("LANE_COUNT", count); //$NON-NLS-1$
  			}
  		}
  	}
docs: Set the preferred number of lanes for a road segment.
  
  @param count is the preferred number of lanes for a road segment.
  @see #DEFAULT_LANE_COUNT