Why has the Tunnel to close for maintenance overnight every 3 months?
This is to facilitate maintenance of equipment within the traffic bores and include cleaning of the walls, road surface, light fittings, CCTV cameras, and pollution sensors. Electrical and mechanical maintenance of pumps, level control equipment and calibration of systems.
Please note, work is normally completed over the first two nights.
What are the average traffic volumes?
The 24 hour count for both traffic bore is in excess of 60,000 vehicles per day
How is pollution measured within the tunnel?
There are sensors in the traffic bores and central bore that measure visibility, Carbon monoxide, Nitric oxide, petroleum fumes and Oxygen levels.
How far under the water is the tunnel?
At high tide the road surface at the lowest point of the tunnel is 20 metres below the water surface
How many lights are in the tunnel?
There are a total of 1158 luminaires in both traffic bore, these consist of a mixture of fluorescents and high pressure sodium (SON-T) lamps. There are six stages of lighting levels that are controlled by photometers measuring the external daylight lighting levels.
What does contraflow mean?
Contraflow is when one of the traffic bores is closed and there is two way (Bidirectional) traffic in the other traffic bore, variable message signs and cones will direct the traffic to the correct lane.
Which national primary road runs through the tunnel?
The N25 is the national primary road that runs through the tunnel, forming the route from Cork to Rosslare Europort. The N25 road is part of the E30 European route that runs from Cork to Moscow and onto Omsk with a total length of 5800km, one of the longest European routes