code: @Pure
  	public static Iterator<BusItineraryHalt> getBusHalts(BusNetwork busNetwork) {
  		assert busNetwork != null;
  		return new NetworkHaltIterator(busNetwork);
  	}
docs: Replies all the bus itinerary halts in the given bus network.
  
  @param busNetwork the bus network.
  @return the iterator on bus itinerary halts.