# Exploiting sets of independent moves in VRP

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## Abstract

Most heuristic methods for VRP and its variants are based on the partial exploration of large neighborhoods, typically by means of single, simple moves applied to the current solution. In this paper we define an extended concept of independent moves and show how even a very standard heuristic method can significantly improve when considering the simultaneous application of carefully chosen sets of moves. We show in particular that, when choosing a set such that the total cost variation is equal to the sum of the variations induced by each single move, the quality of solutions obtained is in general very high. When compared with numerical results obtained by some of the best available heuristics on challenging, large scale, problems, our simple algorithm equipped with the application of optimally chosen independent moves displayed very good quality.

### Keywords

VRP Tabu search Matheuristic Independent moves## Notes

### Acknowledgements

We are grateful to both reviewers and the associate editor for their stimulating comments on the first version of this paper: answering those comments helped us to significantly improve the quality of this paper.

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