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Well, seen; “increase in motor carriage”, “carriage volumes” are OK [but not “volumes of carriages”]; this is missed in your variant. Anyway, my feeling is that the right choice here is "EXPAND [their services]"-this is the very thing that demands "кадры"
To Serhiy Tkachuk: Concerning your disagree: I think you should answer yourself these questions before propose your variants. My point of view -volumes of cariages. For increased number of carriages they need more drivers.