code: @Pure
  	public static String getPreferredAttributeValueForRoadType(RoadType type) {
  		final Preferences prefs = Preferences.userNodeForPackage(RoadNetworkConstants.class);
  		if (prefs != null) {
  			final String v = prefs.get("ROAD_TYPE_VALUE_" + type.name(), null); //$NON-NLS-1$
  			if (v != null && !"".equals(v)) { //$NON-NLS-1$
  				return v;
  			}
  		}
  		return getSystemDefault(type);
  	}
docs: Replies the preferred value of road type
  used in the attributes for the types of the roads.
  
  @param type a type
  @return the preferred name for the given type of the roads.