code: @Pure
  	public static double getPreferredLaneWidth() {
  		final Preferences prefs = Preferences.userNodeForPackage(RoadNetworkConstants.class);
  		if (prefs != null) {
  			return prefs.getDouble("LANE_WIDTH", DEFAULT_LANE_WIDTH); //$NON-NLS-1$
  		}
  		return DEFAULT_LANE_WIDTH;
  	}
docs: Replies the preferred width of a lane for a road segment.
  
  @return the preferred width of a lane for a road segment, in meters.
  @see #DEFAULT_LANE_WIDTH