Slaves were more often employed in agriculture and unskilled industry (some nightmarish conditions there - slaves in the mines had a life expectancy of six months). Roads were often constructed by the Legions and Auxiliaries. Good way to keep soldiers busy and out of trouble in peacetime.
I can’t even imagine the amount of labor that went into building these without machinery.
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Slaves were more often employed in agriculture and unskilled industry (some nightmarish conditions there - slaves in the mines had a life expectancy of six months). Roads were often constructed by the Legions and Auxiliaries. Good way to keep soldiers busy and out of trouble in peacetime.