ByRoute 20, under gradual construction, is intended to link Garristown on the outskirts of DUBLIN with Donegal on ByRoute 1, provisionally via:

In Co. Meath & Co. Louth –

Duleek,

Donore, Knowth / Dowth / Newgrange,

Oldbridge,

MI Junctions 9 & 10, Tullyallen, Mellifont,

Grangegeeth, Lobinstown, Drumcondra;

 In Co. Cavan –

Kingscourt, Dun a Ri Forest Park,

Ballavaly Gap, Glengevlin, Dowra,

Blacklion, Gortahill;

In Co. Leitrim –

Glenfarne, Kilyclogher, Rossinver;

In Co. Fermanagh & Co. Donegal –

Garrison, Beleek, Pettigo & Lough Derg.

(Donegal Town)