Commentaries:
Jamieson, Fausset, and Brown
we will go by the king's highway—probably Wady-el-Ghuweir [ROBERTS], through which ran one of the great lines of road, constructed for commercial caravans, as well as for the progress of armies. The engineering necessary for carrying them over marshes or mountains, and the care requisite for protecting them from the shifting sands, led to their being under the special care of the state. Hence the expression, "the king's highway," which is of great antiquity.
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