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I seem to remember reading that Arnor and Gondor were jointly responsible for the maintenance of the Great Road up till the middle of the Third Age. Surely that implies an interchange of knowledge ?
Also I'm also pretty sure I remember reading somewhere that Gondor kept a small garrison of "Soldiers and Engineers" at Tharbad up until about a hundred years before the War of the Ring.
Tharbad ain't all that far from Rivendell.
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