docs: public static void setPreferredLegalTrafficSide(LegalTrafficSide side) {
  		final Preferences prefs = Preferences.userNodeForPackage(RoadNetworkConstants.class);
  		if (prefs != null) {
  			if (side == null) {
  				prefs.remove("LEGAL_TRAFFIC_SIDE"); //$NON-NLS-1$
  			} else {
  				prefs.put("LEGAL_TRAFFIC_SIDE", side.name()); //$NON-NLS-1$
  			}
  		}
  	}