The county of Kerry suffers from poor access. Towns such as Dingle, Caherciveen, Listowel, and even the county town Tralee are far from any major trunk routes. Dual carriageway penetrating the county most of the way to Tralee and coming from both the Limerick and Cork directions would do much to redress this problem. Although schemes are in preparation to cover some of this distance, they will not reach all the way to Tralee. This dual carriageway aims to widen, through online dualling, the section from Tralee to the Castleisland bypass which opened in October 2010.

Update July 2011: The route that the Tralee Bypass is taking, construction of which began this month, parallels a section of the N21 with a new route for the N22. The N22 and N21 will now be on completely separate routes and interfacing the Tralee Ring Road at different points. Since the N21 will no longer carry the traffic loads for both routes, it may now no longer necessary for it to be dualled. The Tralee Bypass will open in July 2013.

Update March 2013: Since it is now abundantly clear that changes to the N22 brought about by the Tralee Bypass are making this proposal obsolete, this scheme has been removed from the Futures map, and is no longer considered necessary.

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Wikipedia page on this road