code: public static void setPreferredAttributeValuesForTrafficDirection(TrafficDirection direction, String... values) {
  		setPreferredAttributeValuesForTrafficDirection(direction, Arrays.asList(values));
  	}
docs: Set the preferred values of traffic direction
  used in the attributes for the traffic direction on the roads.
  
  @param direction a direction
  @param values are the values for the given direction.