A three-phase heuristic for the vehicle ßeet and route optimization
We consider the applied vehicle routing problem with time windows. Each driver works in a given shift. Each shift has the start, finish and set of pauses which need to be scheduled en route. We introduce the mathematical formulation for this problem in terms of the mixed integer linear programming. In order to tackle large instances, we developed a three-phase local search algorithm with an effective procedure for search in neighbourhoods. Computational experiments for instances from one delivery company have shown the efficiency of the developed algorithm and significant reduction in costs. Tab. 2, ill. 4, bibliogr. 13.