Purpose – This purpose of this paper is to present a methodology for optimally planning long-haul road transport activities through proper aggregation of customer orders in separate full-truckload or less-than-truckload shipments in order to minimize total transportation costs. Design/methodology/approach – The model is applied to a speciﬁc Italian multi-plant ﬁrm operating in the plastic ﬁlm for packaging sector. The method, given the order quantities to be shipped and the location of customers, aggregates shipments in subgroups of compatible orders resorting to a heuristic procedure and successively consolidates them in optimized full truck load and less than truck load shipments resorting to a Genetic Algorithm in order to minimize total shipping costs respecting delivery due dates and proper geographical and truck capacity constraints. Findings – The paper demonstrates that evolutionary computation techniques may be effective in tactical planning of transportation activities. The model shows that substantial savings on overall transportation cost may be achieved adopting the proposed methodology in a real life scenario. Research limitations/implications – The main limitation of this optimisation methodology is that an heuristic procedure is utilized instead of an enumerative approach in order to at ﬁrst aggregate shipments in compatible sets before the optimisation algorithm carries out the assignments of customer orders to separate truckloads. Even if this implies that the solution could be sub-optimal, it has demonstrated a very satisfactory performance and enables the problem to become manageable in real life settings. Practical implications – The proposed methodology enables to rapidly choose if a customer order should be shipped via a FTL or a LTL transport and performs the aggregation of different orders in separate shipments in order to minimize total transportation costs. As a consequence, the task of logistics managers is greatly simpliﬁed and consistently better performances respect manual planning can be obtained. Originality/value – The described methodology is original in both the kind of approach adopted to solve the problem of optimising orders shipping in long-haul direct shipping distribution logistics, and in the solution technique adopted which integrates heuristic algorithm and an original formulation of a GA optimisation problem. Moreover, the methodology solves both the truckload assignment problem and the choice of LTL vs FTL shipment thus representing an useful tool for logistics managers.
|Titolo:||A genetic approach for freight transportation planning|
|Data di pubblicazione:||2006|
|Appare nelle tipologie:||1.1 Articolo in rivista|