EGIS Road & Tunnel Operations Ireland

Jack Lynch Tunnel

Jack Lynch Tunnel

The Jack Lynch Tunnel, an immersed tube passageway, is a vital component of Cork’s N40 southern ring road. It’s dedicated to the memory of Jack Lynch, a Cork native and former Taoiseach. This tunnel allows the road to pass beneath the River Lee. To the north of the tunnel, the ring road links up with the M8/N8 & N25 via the newly upgraded Dunkettle Interchange heading north to Dublin and the N8 road leading to the city centre in the west. Additionally, the N25 route begins its eastward journey to Waterford from this point.

General Tunnel Details

The tunnel measures 620 metres in length. In each traffic bore, there are six emergency exits for pedestrians leading to the central bore, which has with exit doors located at either end.

Each traffic bore is equipped with twelve emergency panels containing hose reels and fire extinguishers. Fans are employed to pressurise the central bore, preventing smoke from entering when an emergency door is opened. The lighting inside the central bore (pedestrian exit) activates fully approximately ten seconds after a door is opened.

The first emergency telephone in each bore is positioned 50 metres into the tunnel, with additional phones every 50 metres thereafter. Within the Northbound bore, approach, and exit ramps, there are fifteen emergency telephones. In the Southbound bore, approach, and exit ramp, there are fourteen emergency telephones.

Tunnel Information

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The Tunnel runs under the river Lee. At the North portal the ring road joins the M8 to Dublin & the N8 road to Cork city centre, with the N25 East towards Waterford.


1.8 km


Operating Height 4.6m

Journey Time

Approximately 12 minutes


Tarmac Construction & PJ Walls


The National Roads Authority with funding from the Cohesion Fund, European Union

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