code: @Pure
  	public BusItineraryHalt getBusHaltAt(int index) {
  		if (index < this.validHalts.size()) {
  			return this.validHalts.get(index);
  		}
  		return this.invalidHalts.get(index - this.validHalts.size());
  	}
docs: Replies the halt at the specified index.
  
  @param index the index.
  @return a bus halt