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Vehicle routing problems in the real world often require custom scenarios, and no VRP solver does everything, so this is a good question. The VRP solver in OR-Tools is open source (you could fork it and add your own customizations if you wanted), and new features have been added to it continually for over a decade. And speaking for Google, we're committed to ...


The model you linked in the question will do the job. You just set $a_{jt}=0$ if a worker on shift $j$ would be taking a break at time $t$.

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