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N4 road (Ireland)
The N4 road is a national primary road in Ireland, running from Dublin to the northwest of Ireland and Sligo town. The M6 to Galway diverges from this route after Kinnegad, while the N5 to Westport diverges at Longford town. Most sections of the N4 that are motorway-standard are designated the M4 motorway.
The N4 originates at an intersection with the M50 motorway at Junction 7. This is also Junction 1 of the N/M4. The Liffey Valley Shopping Centre is located at Junction 2. The road has three lanes and a bus lane in each direction between the M50 and Junction 5 which is also the start of the M4 motorway at Leixlip.
The N4 was the only one of the main inter-urban national routes whose dual-carriageway section continued into the city centre; however, the section inside the M50 was re-classified as the R148 in 2012.
Heading west, the PPP motorway section (see below) ends west of Kinnegad, and the motorway terminates 5 km further west; it continues as HQDC and bypasses Mullingar. From the Mullingar bypass to Edgeworthstown, the road is a wide single-carriageway with hard shoulders. After Longford, the road passes through Newtown Forbes and there is a lower standard single-carriageway road between Newtown Forbes and Roosky. Between Longford and Rooskey single carriageway continues at a higher standard. Dromod and Rooskey were bypassed in late 2007. This section of the road consists of three roundabouts and a Type 2 dual carriageway, i.e.: two lanes in each direction and no hard shoulder. The road resumes as a single carriageway with hard shoulders until it reaches Carrick-on-Shannon, where it becomes a local urban road through five roundabouts, and passes over the River Shannon into County Roscommon. The road becomes a high-quality single carriageway bypass 3 km outside of Boyle town, with periodic alternating overtaking lanes passing Lough Key Forest Park and Ballinafad until it reaches Castlebaldwin. From Castlebaldwin to Collooney the road is a Type 2 dual carriageway. Funding for the expansion of this section was announced in October 2018, and it opened in 2021. The road becomes near-motorway standard dual carriageway again at Collooney, approaching Sligo town.
The section from Leixlip to the west of Kinnegad is the M4 motorway. The first section of this motorway (Leixlip – Kilcock) was opened on 19 December 1994.[citation needed]
Under the Government announcement of the pilot projects on 1 June 1999 this project was to be assessed by the NRA for its suitability to be advanced as a Public-private partnership (PPP). Subsequently, the project was included as one of the projects approved under Tranche II of the PPP Roads programme as announced by the NRA in June 2000. The project involved the construction of 39 km of motorway from Kinnegad to Kilcock and is an extension of the Kilcock-Maynooth-Leixlip motorway on the N4/N6 Sligo/Galway to Dublin route. The motorway bypasses the towns of Enfield and Kinnegad.[citation needed]
The PPP contract was awarded in March 2003 to the EuroLink Consortium (SIAC Construction Ltd and Cintra - Concesiones de Infraestructuras de Transporte S.A.) and allows for them to collect tolls for 30 years from that date.
This tolled section (from Kilcock to Kinnegad) opened on 12 December 2005, almost a year ahead of schedule. It is the second-most expensive toll road in Ireland (after the Dublin Port Tunnel). A toll of €3.50 (as of 2025) for cars is charged at a toll plaza just west of Kilcock and at smaller toll plazas at on and off-ramps at Enfield. Between Enfield and Kinnegad, no further access to the M4 is possible.
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N4 road (Ireland)
The N4 road is a national primary road in Ireland, running from Dublin to the northwest of Ireland and Sligo town. The M6 to Galway diverges from this route after Kinnegad, while the N5 to Westport diverges at Longford town. Most sections of the N4 that are motorway-standard are designated the M4 motorway.
The N4 originates at an intersection with the M50 motorway at Junction 7. This is also Junction 1 of the N/M4. The Liffey Valley Shopping Centre is located at Junction 2. The road has three lanes and a bus lane in each direction between the M50 and Junction 5 which is also the start of the M4 motorway at Leixlip.
The N4 was the only one of the main inter-urban national routes whose dual-carriageway section continued into the city centre; however, the section inside the M50 was re-classified as the R148 in 2012.
Heading west, the PPP motorway section (see below) ends west of Kinnegad, and the motorway terminates 5 km further west; it continues as HQDC and bypasses Mullingar. From the Mullingar bypass to Edgeworthstown, the road is a wide single-carriageway with hard shoulders. After Longford, the road passes through Newtown Forbes and there is a lower standard single-carriageway road between Newtown Forbes and Roosky. Between Longford and Rooskey single carriageway continues at a higher standard. Dromod and Rooskey were bypassed in late 2007. This section of the road consists of three roundabouts and a Type 2 dual carriageway, i.e.: two lanes in each direction and no hard shoulder. The road resumes as a single carriageway with hard shoulders until it reaches Carrick-on-Shannon, where it becomes a local urban road through five roundabouts, and passes over the River Shannon into County Roscommon. The road becomes a high-quality single carriageway bypass 3 km outside of Boyle town, with periodic alternating overtaking lanes passing Lough Key Forest Park and Ballinafad until it reaches Castlebaldwin. From Castlebaldwin to Collooney the road is a Type 2 dual carriageway. Funding for the expansion of this section was announced in October 2018, and it opened in 2021. The road becomes near-motorway standard dual carriageway again at Collooney, approaching Sligo town.
The section from Leixlip to the west of Kinnegad is the M4 motorway. The first section of this motorway (Leixlip – Kilcock) was opened on 19 December 1994.[citation needed]
Under the Government announcement of the pilot projects on 1 June 1999 this project was to be assessed by the NRA for its suitability to be advanced as a Public-private partnership (PPP). Subsequently, the project was included as one of the projects approved under Tranche II of the PPP Roads programme as announced by the NRA in June 2000. The project involved the construction of 39 km of motorway from Kinnegad to Kilcock and is an extension of the Kilcock-Maynooth-Leixlip motorway on the N4/N6 Sligo/Galway to Dublin route. The motorway bypasses the towns of Enfield and Kinnegad.[citation needed]
The PPP contract was awarded in March 2003 to the EuroLink Consortium (SIAC Construction Ltd and Cintra - Concesiones de Infraestructuras de Transporte S.A.) and allows for them to collect tolls for 30 years from that date.
This tolled section (from Kilcock to Kinnegad) opened on 12 December 2005, almost a year ahead of schedule. It is the second-most expensive toll road in Ireland (after the Dublin Port Tunnel). A toll of €3.50 (as of 2025) for cars is charged at a toll plaza just west of Kilcock and at smaller toll plazas at on and off-ramps at Enfield. Between Enfield and Kinnegad, no further access to the M4 is possible.