| Split (km) | Directions | Road | Total (km) |
|---|---|---|---|
| 0.0 | At Junction 79 roundabout take the 1st exit onto North Wall Quay (signposted Terminal 3) | - | 0.0 |
| 0.2 | Dublin Port | - | 0.2 |
| 0.7 | Junction 75, at traffic signals continue forward onto Custom House Quay (signposted City Centre) | - | 0.9 |
| 0.7 | Turn left onto the R105 | R105 | 1.6 |
| 0.1 | Talbot Memorial Bridge | R105 | 1.7 |
| 0.0 | At Junction 2 take right hand lanes bear right onto George's Quay - R105 (signposted City Centre) | R105 | 1.7 |
| 0.2 | Junction 42, at traffic signals continue forward onto George's Quay - N11 (signposted The West N4, N5, N6) | N11 | 1.9 |
| 0.3 | At traffic signals continue forward onto Aston Quay - N4 | N4 | 2.2 |
| 0.6 | At traffic signals continue forward onto Essex Quay - N4 | N4 | 2.8 |
| 0.2 | Dublin Corporation Offices | N4 | 3.0 |
| 0.1 | At traffic signals continue forward onto Merchant's Quay - N4 | N4 | 3.1 |
| 0.3 | Junction 21, at traffic signals continue forward onto Usher's Quay - N4 (signposted N4, N7, M50) | N4 | 3.4 |
| 0.5 | Junction 23, at traffic signals continue forward onto Usher's Island - N4 | N4 | 3.8 |
| 0.4 | St James's Brewery (on left) | N4 | 4.2 |
| 0.1 | At traffic signals turn left onto Saint John's Road West - N4 (signposted The West, N7, M50) | N4 | 4.3 |
| 0.3 | Heuston Station (on right) | N4 | 4.6 |
| 1.0 | At Junction 63 continue forward onto Con Colbert Road - N4 | N4 | 5.6 |
| 0.4 | War Memorial Park | N4 | 6.1 |
| 0.1 | At traffic signals continue forward onto Con Colbert Road - N4 | N4 | 6.2 |
| 4.2 | At traffic signals continue forward onto Lucan Road - N4 | N4 | 10.4 |
| 0.7 | At Junction with M50 (Jct 1) take right-hand lanes to continue with the N4 (signposted Sligo) | N4 | 11.2 |
| 6.4 | Continue forward onto the M4 (signposted Sligo) | M4 | 17.6 |
| 28 | Toll Plaza | M4 | 45.06 |
| 18.6 | Continue forward onto the N4 (signposted Sligo) | N4 | 64.3 |
| 43.3 | At roundabout take 1st exit onto Ballymahon Road - N4 (signposted Sligo) | N4 | 107.6 |
| 0.5 | At roundabout take 2nd exit onto the N4 (signposted Sligo) | N4 | 108.1 |
| 9.8 | At roundabout take 2nd exit onto the N4 (signposted Sligo) | N4 | 117.9 |
| 2.6 | At roundabout take 1st exit onto the N5 (signposted Westport) | N5 | 120.5 |
| 0.1 | Turn left onto the N5 Entering Longford | N5 | 120.6 |
| 1.9 | Continue forward onto Dublin Street - N5 (signposted Westport) | N5 | 122.4 |
| 0.0 | Turn left onto New Street - N63 | N63 | 122.5 |
| 0.2 | Bear right onto Ballymahon Street - N63 (signposted Westport) | N63 | 122.6 |
| 0.2 | At traffic signals turn left onto Richmond Street - N5 | N5 | 122.8 |
| 8.2 | Continue forward on N5 through Termonbarry | N5 | 131.3 |
| 13.6 | Continue forward on N5 entering Strokestown | N5 | 144.8 |
| 0.6 | At roundabout take 1st exit onto French Court - N5 (signposted Westport) | N5 | 145.4 |
| 10.4 | Continue forward on N5 through Tulsk | N5 | 155.8 |
| 11.4 | Continue forward on N5 through Bellanagare | N5 | 167.2 |
| 15.9 | Continue forward on N5 entering Ballaghaderreen | N5 | 183.1 |
| 0.8 | At staggered crossroads veer left then turn sharp right onto N5 (signposted Westport) | N5 | 183.9 |
| 26.0 | Continue forward on N5 (signposted Westport) | N5 | 210.0 |
| 9.2 | Continue forward on N5 through Bohola | N5 | 219.2 |
| 6.8 | Continue forward on N5 through Bellavary | N5 | 226.0 |
| 10.2 | Continue forward onto Dublin Road - N5 Entering Castlebar | N5 | 236.2 |
| 0.3 | At roundabout take 2nd exit onto N5 (signposted Westport) | N5 | 236.5 |
| 0.9 | At roundabout take 2nd exit onto N5 (signposted Westport) | N5 | 237.4 |
| 1.2 | At roundabout take 2nd exit onto Lannagh Road - R310 (signposted Achill, Town Centre) | R310 | 238.6 |
| 0.8 | At roundabout take 2nd exit onto Lannagh Road - R310 | R310 | 239.4 |
| 0.4 | At traffic signals turn left onto Newport Road - R311 (signposted Achill) | R311 | 239.8 |
| 17.5 | Continue forward onto Castlebar Street - R311 Entering Newport | R311 | 257.2 |
| 0.5 | Turn right onto Castlebar Street - N59 | N59 | 257.7 |
| 15.8 | Continue forward on N59 through Mallaranny | N59 | 273.6 |
| 2.1 | Branch left onto Achill Road - R319 (signposted Achill) | R319 | 275.6 |
| 13.3 | Enter Achill Sound via new swing bridge. Achill Cottages are located 2km from the bridge. ACHILL HOLIDAY COTTAGES FROM THE BRIDGE AT ACHILL SOUND CONTINUE ON THROUGH THE VILLAGE OF ACHILL SOUND TILL YOU PAST "MC LOUGHLINS PUB" ON YOUR LEFT. TAKE THE NEXT TURNING ON YOUR RIGHT AFTER APPROX. 0.5 MILES / 500 METRES AND ACHILL HOLIDAY COTTAGES ARE 100 METRES ON YOUR LEFT. |
R319 | 288.9 |