The N23 is a national primary road located entirely within County Kerry. With a length of just 9½ kilometres, the route is one of the shorter national primary routes, merely forming a link road between the N21 Limerick – Tralee route at Castleisland to the N22 Tralee – Killarney – Cork route at Farranfore. This facilitates traffic passing between Limerick and Killarney, allowing it to avoid detouring into Tralee.
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