docs: @Pure
  	public static List<String> getPreferredAttributeValuesForTrafficDirection(TrafficDirection direction) {
  		final List<String> array = new ArrayList<>();
  		int i = 0;
  		String value = getPreferredAttributeValueForTrafficDirection(direction, i);
  		while (value != null) {
  			array.add(value);
  			value = getPreferredAttributeValueForTrafficDirection(direction, ++i);
  		}
  		return array;
  	}