Limerick Tunnel

The Limerick Tunnel PPP Scheme is 10 km length of tolled dual carriageway bypass to the south west of the city of Limerick, including a 675m long immersed tube tunnel under the River Shannon.

The Limerick Tunnel was constructed as part of the wider scheme within Phase 2 of the Limerick South Ring Road project in Ireland.

Delivered as a Public Private Partnership project, the Limerick Tunnel was designed to ease congestion on the major road networks. The tunnel has the capacity to divert approximately 40,000 vehicles out of Limerick City Centre every year. Usage of the Limerick Tunnel has steadily increased since its launch.

With a total investment level of €437m, the scheme required the construction of a 10km tolled bypass and a 675m long tunnel immersed under the River Shannon. Despite the complex civil engineering design, it opened to the public in July 2010 – two months ahead of schedule.

FIM provides Mezzanine agent services.

Key facts

10km tolled bypass, with a 675m section immersed under the River Shannon

The tunnel forms part of the N18 Limerick Southern Ring Road

Construction took four years to complete. Opened to traffic in July 2010

35-year concession

Case Study

Project: Limerick Tunnel operation and maintenance

Key task: Procurement of O&M contract

Investment: Circa €120,000

Benefits: Cost variability and risks reduced; performance and value of service assured

High standards of performance from the Limerick Tunnel have been assured for a further six years, following the appointment of a new Operation & Maintenance contractor. Careful attention paid to correct processes in the tendering and awarding of the contract was matched by the way the new deal was set up to be monitored by concessionaire DirectRoute – ensuring the continuing success of this vital piece of infrastructure.

Limmerick tunnel at night
Limmerick tunnel at night

Timeline

ESG

The Shannon Estuary is a Special Area of Conservation (SAC) and home to a variety of protected species, including the Triangular Club-rush. During construction works, this flowering tidal plant was relocated and protected in a temporary habitat before being permanently replanted close to its original location. There were also various species of birds found around the lake area where protection measures were implemented.

Long term energy and maintenance costs and carbon emissions have been cut with the installation of a Lighting Energy Controller system reducing the ecological footprint.