M20 motorway (Ireland)

M20 motorway (Ireland)
Country	IRL
Route	M20
Termini a	Limerick (city)
Termini b	Cork (city)
Counties	County Limerick, County Cork

M20 motorway (Ireland) is a planned high-capacity transport corridor intended to connect Limerick (city) and Cork (city) in the Province of Munster. The proposal has been discussed by Transport Infrastructure Ireland, Department of Transport (Ireland), and local authorities including Limerick City and County Council and Cork County Council as part of national strategic road schemes. Proposals intersect with various regional planning frameworks such as the National Development Plan (Ireland) and the Regional Spatial and Economic Strategy for Southern Region (Ireland).

Route description

Proposed alignments would generally run south-southeast from the outskirts of Limerick (city) through County Limerick toward the outskirts of Cork (city) near suburbs such as Ballincollig and Blarney. The corridor interfaces with existing infrastructure including the M7 motorway (Ireland) near Limerick Junction, the N20 road (Ireland) corridor through towns like Buttevant, Doneraile, Charleville, and the N24 road (Ireland) junctions near Cork Airport. Planned interchanges anticipate connections with regional roads serving Mallow, Fermoy, Mitchelstown, and Newmarket. Proposals considered integration with public transport hubs such as Cork Kent Station and Limerick Colbert railway station as well as freight facilities at ports including Cork Harbour and Shannon–Foynes Port.

History

The M20 concept emerged amid post-1990s growth in Irish motorway construction led by projects like the M7 motorway (Ireland), M8 motorway (Ireland), and the M1 motorway (Ireland). Early strategic studies by Roads Service (Ireland) and later by Transport Infrastructure Ireland examined upgrading the existing N20 road (Ireland) to motorway standard, following precedents set by upgrades such as the M18 motorway (Ireland) and the M17/M18 Ennis to Tuam scheme. Political advocacy from representatives including members of Dáil Éireann and county councilors influenced corridor prioritisation within the National Development Plan (2007–2013) and subsequent capital investment programmes. Public consultations involved agencies including the Environmental Protection Agency (Ireland) and heritage bodies such as National Monuments Service and Irish Naturalists' Journal contributors, with archaeological interests linked to sites in County Limerick and County Cork.

Planned upgrades and proposals

Proposed schemes have included full motorway builds, motorway bypasses, and staged dual-carriageway upgrades similar to the N4/M4 and N5 projects. Detailed options were assessed under environmental impact frameworks used in assessments for projects like the M11 Gorey–Oilgate and M3 Clonee–Kells schemes. Stakeholders included Irish Rail, Shannon Group, and business organisations like Cork Chamber and Limerick Chamber. Funding scenarios referenced allocations within the National Development Plan (2018–2027) and possibilities for public-private partnership models similar to those used for the M50 motorway (Ireland) enhancements. Transport modelling used software and standards common to projects such as the TEN-T network and European comparative schemes like E-road network corridors.

Junctions and exits

Planned junctions were proposed to serve existing settlements and strategic nodes: northern connection points near Castletroy and Annacotty close to Limerick University Hospital and University of Limerick, intermediate junctions near Charleville and Buttevant to serve commuter and freight traffic, and southern termini near Ballincollig with links to N22 road (Ireland). Interchange design principles drew on precedents at the M8 Fermoy bypass, grade-separated models used on the M6 motorway (Ireland), and junction classification standards from Transport Infrastructure Ireland. Proposals included park-and-ride facilities serving commuter flows to Cork Airport and bus-rail interchange points aligned with services by Bus Éireann and private operators.

Traffic and usage

Traffic forecasts referenced demand studies comparable to those for the M8 motorway (Ireland) and projected modal shifts influenced by commuter patterns between Cork (city) and Limerick (city). Freight projections considered links to ports including Cork Harbour, Foynes, and freight terminals in Limerick (city) and Cork (city), and competition with routes like the N25 road (Ireland). Models evaluated peak directional flows, growth scenarios tied to employment centres such as University College Cork and Technological University of the Shannon: Midlands Midwest, and seasonal variations related to tourism attractions like Blarney Castle and Fota Wildlife Park. Traffic management proposals referenced safety improvements similar to those on the M9 motorway (Ireland).

Environmental and community impact

Environmental assessment processes paralleled those used in projects overseen by the Environmental Protection Agency (Ireland), including evaluations of habitats listed under European Union Habitats Directive and Birds Directive designations affecting areas near River Blackwater (Munster), River Mulkear, and wetland sites. Community consultations involved parish councils, business groups like Cork Business Association, and heritage organisations such as An Taisce and Irish Heritage Trust. Archaeological mitigation referenced precedents set during construction of the M3 motorway (Ireland), with potential impacts on protected structures, landscapes referenced in the National Inventory of Architectural Heritage, and measures for noise attenuation informed by standards applied on projects like the M50 upgrade. Proposals included biodiversity offsetting, river-crossing design to protect salmonid populations associated with agencies such as Inland Fisheries Ireland, and socio-economic assessments related to commuting, tourism, and regional development.

Category:Motorways in the Republic of Ireland Category:Proposed roads in the Republic of Ireland