“…In those methods, certain hand-crafted rules are always designed to cope with the hard constraints so that the computation could be expedited when searching a solution of satisfactory quality. Following this principle, a number of heuristic methods have been attempted to handle the simple variants of VRP in AGH, which only consider a single operation, i.e., de-icing [3], towing [4], catering [5], fueling [6], trailering [7], and baggage loading and unloading [8], respectively. Although some success has been achieved, they fail to consider those operations simultaneously and their precedence relation, which may render them less effective for solving the real world routing problems in AGH.…”