I'm quite sure many of those trucks drive on any type of surface...regardless if it's a dirt road or a paved one.
It's not like most of those drivers have much of a choice, kozuh. Most roads in that part of the world happen to be unpaved; in fact most of those roads have been carved out by numerous caravans following ancient trade routes...some of which, as you pointed out correctly, were taken by Alexander the Great many years ago.
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