code: @Pure
  	public static String getSystemDefault(RoadType type) {
  		switch (type) {
  		case OTHER:
  			return DEFAULT_OTHER_ROAD_TYPE;
  		case PRIVACY_PATH:
  			return DEFAULT_PRIVACY_ROAD_TYPE;
  		case TRACK:
  			return DEFAULT_TRACK_ROAD_TYPE;
  		case BIKEWAY:
  			return DEFAULT_BIKEWAY_ROAD_TYPE;
  		case LOCAL_ROAD:
  			return DEFAULT_LOCAL_ROAD_ROAD_TYPE;
  		case INTERCHANGE_RAMP:
  			return DEFAULT_INTERCHANGE_RAMP_ROAD_TYPE;
  		case MAJOR_URBAN_AXIS:
  			return DEFAULT_MAJOR_URBAN_ROAD_TYPE;
  		case SECONDARY_ROAD:
  			return DEFAULT_SECONDARY_ROAD_TYPE;
  		case MAJOR_ROAD:
  			return DEFAULT_MAJOR_ROAD_TYPE;
  		case FREEWAY:
  			return DEFAULT_FREEWAY_ROAD_TYPE;
  		default:
  		}
  		throw new IllegalArgumentException();
  	}
docs: Replies the system-default value for the type of
  road.
  
  @param type a type
  @return the system-default value.
  @throws IllegalArgumentException if bad type.