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The route nationale 18 (RN18) is a trunk road ( nationale) [1] in north east France. [2] The RN 18 was constructed in 1959.
The road begins at Étain at a junction with the N3, heads north to Longuyon and then turns northeast to Longwy where the road meets the N52. [3] There the road forks as the D918: the north fork crosses the frontier to Belgium (N830) and the eastern fork enters Luxembourg as the N5.