The split delivery vehicle routing problem is concerned with serving the demand of a set of customers with a fleet of capacitated vehicles at minimum cost. Contrary to what is assumed in the classical vehicle routing problem, a customer can be served by more than one vehicle, if convenient. We present a solution approach that integrates heuristic search with optimization by using an integer program to explore promising parts of the search space identified by a tabu search heuristic. Computational results show that the method improves the solution of the tabu search in all but one instance of a large test set. Link to the article
ARCHETTI, C., SPERANZA, M.G. and SAVELSBERGH, M.W.P. (2008). An Optimization-Based Heuristic for the Split Delivery Vehicle Routing Problem. Transportation Science, 42(1), pp. 22-31.