Motorways in Ireland – Routes, History and Expansion

Ireland’s motorway network is one of the country’s most visible infrastructure achievements of the past four decades. From a single short bypass opened in 1983 to a 916-kilometre system connecting Dublin to every major regional city, the motorway programme has fundamentally changed how Ireland moves people and goods. Yet the network is still relatively young by European standards, and significant gaps remain – particularly in the west and northwest.

This guide covers the history of motorway construction in Ireland, the current network, toll roads, the projects under way and the investment planned for the years ahead.

📜 A Brief History of Irish Motorways

The first section of motorway in the Republic of Ireland opened in 1983 – a short stretch of the M7 bypassing Naas in County Kildare, together with the first section of the M1 (which has since been redesignated as part of the M50). In 1985, the M1 was extended to Dublin Airport.

Progress was slow through the late 1980s, but the 1990s brought a step change. The western section of the M50, linking the N7, N4 and N3, opened in 1990. The M11 Bray/Shankill bypass followed in 1991. After a construction lull in the mid-1990s, the Celtic Tiger economic boom and an influx of EU structural funding enabled a dramatic acceleration. Roads that had previously been designated as national primary routes were progressively upgraded to motorway standard, and entirely new sections were built to bypass congested towns and link regional cities.

The period between 2005 and 2010 was the most intensive in Irish motorway history. The completion of the Major Inter-Urban (MIU) motorway programme connected Dublin to Cork (M7/M8), Galway (M4/M6), Limerick (M7) and Waterford (M9) by the end of 2010, adding over 300 kilometres of new motorway in just five years. The M8, stretching from Urlingford to east of Mitchelstown, became the longest motorway in Ireland when it opened in sections through 2008.

By the end of 2009, Ireland had 667 kilometres of motorway with 385 kilometres still under construction. The pace of new construction slowed sharply after the 2008 financial crisis, but redesignation of existing dual-carriageway sections continued to expand the official motorway total. Today, the network extends approximately 916 kilometres.

🗺️ The Current Motorway Network

Ireland’s motorways radiate outward from Dublin, connecting the capital to all five regional cities. The main routes are:

M1 – Dublin to Dundalk, continuing as a dual carriageway to connect with Northern Ireland’s motorway network. This is the primary route to Belfast and carries significant cross-border traffic.

M4/M6 – Dublin to Galway via Maynooth, Kinnegad and Athlone. Completed in December 2009, this was the first complete city-to-city motorway in the State.

M7 – Dublin to Limerick via Naas, Portlaoise and Nenagh. One of the busiest motorways in Ireland, it also connects to the M8 for Cork-bound traffic at the Junction 19 interchange near Portlaoise.

M8 – Links the M7 at Portlaoise to Cork, running via Cashel, Cahir and Mitchelstown. The longest motorway route in the country.

M9 – Dublin to Waterford via Carlow and Kilkenny. Completed in September 2010, it was the last of the MIU motorways to open.

M50 – Dublin’s orbital motorway, encircling the western and southern suburbs of the city. It is by far the busiest road in Ireland, carrying the highest traffic volumes and acting as the intersection point for all major routes entering and leaving Dublin. The M50 uses a barrier-free electronic tolling system at the West Link. Average daily traffic volumes on the busiest sections regularly exceed 100,000 vehicles, and traffic growth of 7% was recorded across the national network in 2024 alone. Despite a major upgrade completed in 2010 that widened sections to three lanes in each direction, congestion on the M50 remains a persistent problem during peak hours.

Other motorway sections include the M11 (serving the Dublin-Wexford corridor), the M17 and M18 (connecting Galway to the Limerick road network), the M20 approach to Limerick and the N40 Cork Ring Road (which includes motorway-standard sections).

Approximately 320 kilometres of the 916-kilometre network is operated under Public Private Partnerships, with the remaining sections managed through Motorway Maintenance and Renewal Contracts. TII’s national control centre monitors over 65 million vehicle journeys per year across the network, using traffic counters that identify vehicle class and volume by hour of day.

Motorway service areas are located at regular intervals along major routes, providing fuel, food and rest facilities for drivers. The service area network has expanded in recent years, with modern plazas at locations including the Barack Obama Plaza (M7), the Gorey service area (M11) and Cashel (M8). As Ireland transitions to electric vehicles, the integration of EV charging infrastructure into service areas is becoming a priority, with dedicated funding allocated under the 2026-2030 investment plan.

For a broader look at the road network beyond motorways, see our guide to roads in Ireland.

💶 Tolls on Irish Motorways

Ten toll points operate on the Irish motorway network – eight under PPP arrangements and two managed directly by TII (the M50 and the Dublin Port Tunnel). Toll rates are subject to annual CPI-linked adjustments. From 1 January 2026, rates increased in line with the August 2024 to August 2025 CPI figure of 2%.

The M50’s eFlow electronic tolling system is barrier-free, using overhead gantries to automatically register vehicles as they pass. Other toll plazas typically use a combination of cash, tag and card payment options, though the trend is toward fully electronic tolling across the network.

Tolls have been a source of ongoing public debate. Critics argue that PPP toll arrangements, some of which run for 30 years or more, represent poor value for the taxpayer and create perverse incentives where traffic avoiding toll roads increases congestion on alternative routes. Defenders point to the fact that PPP models enabled the rapid construction of motorways during a period when the State could not have funded the entire programme from exchequer resources alone.

🚧 Motorway and National Road Projects Under Way

Several major road projects are currently under construction or advancing through planning and procurement. The most significant include:

M28 Cork to Ringaskiddy – a new motorway-standard route providing improved access between Cork city and the deep-water port at Ringaskiddy. This project is currently under construction and is a strategic priority for freight and trade logistics. The Government is investing approximately €150 million in the bypass.

N21/N69 Limerick to Foynes (including Adare Bypass) – this project bypasses the heavily congested village of Adare in County Limerick and improves access to Foynes Port. Construction is underway.

N5 Ballaghaderreen to Scramoge – a major upgrade of the N5 in County Roscommon, currently under construction, which will improve connectivity between Dublin and the northwest.

Projects at earlier stages include the Donegal TEN-T Project (part of the EU’s Trans-European Transport Network), the N24 Cahir to Limerick Junction, the Slane Bypass in County Meath, the N11/M11 upgrade for the Dublin-Wexford corridor, and – subject to a planning decision from An Coimisiun Pleanala – the long-awaited Galway City Bypass, which would link the M6, M17 and M18 around the western side of the city. Construction on the Western Rail Corridor between Athenry and Claremorris is also expected to begin in 2028, complementing road improvements in the west.

🔒 Motorway Safety Features and Regulations

Irish motorways include several safety features not found on other road classes. All motorway sections have continuous hard shoulders, crash barriers separating opposing carriageways, superior lighting at interchanges and emergency phones at regular intervals. Speed limits on motorways are set at 120 km/h – the highest permitted speed on any Irish road. Certain categories of vehicle and driver are prohibited from using motorways, including learner drivers, cyclists, pedestrians and vehicles with engine capacity below 50cc.

Motorways can only be accessed through grade-separated junctions, typically taking the form of roundabout interchanges for high-capacity junctions or dumbbell-style interchanges for lower-traffic connections. The M50/N7 and M50/N4 junctions use partial cloverleaf designs, while the M4/M6 and M7/M9 connections use fork-style interchanges. The Dublin Port Tunnel, which links the M1 to the port area, carries special height and vehicle restrictions and is a critical freight corridor for the city.

Road signs on Irish motorways follow a distinct colour scheme – blue background for motorway signage and green for national road direction signs. All distance information is displayed in kilometres, and signs are bilingual (Irish and English) except in Gaeltacht areas where only Irish is used. Driving is on the left-hand side of the road, a convention shared with Northern Ireland and the wider United Kingdom.

📈 Investment to 2030 and Beyond

The 2026-2030 Sectoral Investment Plan allocates €9.7 billion to roads, covering both the renewal of the existing network and the construction of new routes. This represents a significant commitment, though it is notable that the ratio of investment between public transport (€10.1 billion) and roads (€9.7 billion) has shifted compared to earlier plans when the Green Party was in government and the ratio was approximately 2:1 in favour of public transport.

Transport Minister Darragh O’Brien has argued that the current plan represents the largest number of public transport projects ever being delivered in a five-year period, while also recognising that roads remain critical for connectivity, safety and economic development – particularly outside the major cities.

The motorway network itself is largely complete in terms of connecting Dublin to the main regional cities. The focus for the next decade is on improving access to the northwest and west (where motorway-standard connections remain limited), constructing bypasses around congested towns, upgrading key freight corridors and investing in the EV charging network that will be essential as the vehicle fleet transitions to electric.

🏙️ Motorways, Congestion and Urban Sprawl

The motorway programme has delivered enormous benefits in terms of journey times, road safety and regional connectivity. Trips that once took four or five hours – such as Dublin to Galway or Dublin to Cork – can now be completed in under three hours.

However, the availability of high-speed road connections has also facilitated patterns of car-dependent suburban and exurban development. Towns along motorway corridors have expanded rapidly as commuter settlements, often without corresponding investment in public transport or local services. The revised National Planning Framework, introduced in April 2025, explicitly addresses this by emphasising compact urban growth aligned with high-capacity public transport corridors.

Congestion on the M50 and key urban approaches remains severe, with the Department of Transport estimating annual congestion costs of approximately €330 million in the Greater Dublin Area alone – projected to rise to €1.5 billion per year by 2040. The Government’s Moving Together strategy, published in March 2026, sets out a collaborative approach to tackling this challenge through demand management, public transport improvement and active travel investment.

Ireland’s motorway network is a foundation – not a finished product. The challenge ahead is ensuring that road investment complements rather than undermines the broader shift toward sustainable mobility, while still serving the connectivity needs of regions that have no realistic alternative to car travel for the foreseeable future. For the full picture of how these investments fit together, see our pillar guide to transport infrastructure in Ireland.