A new speed enforcement system is due to go live in Dublin Port Tunnel in the coming weeks, according to AA Roadwatch.
The cameras will be the first in Ireland to work on an average speed basis rather than by video or at a fixed point.
Similar technology was used on a trial basis on the M7 earlier this year.
This means that they will record the time that a vehicle enters and exits the tunnel and divide the 4.8km distance between Coolock and Dublin Port by the elapsed time in order to calculate an average speed.
If that average exceeds 80km/h, the vehicle’s registration details will be automatically passed on to Gardaí for enforcement action.
Any driver that completes the tunnel in under 3m 36s will be in breach of the limit.
Transport Infrastructure Ireland (TII) said that the system will not have flashing lights or other indicators, but it will be monitoring at all times.
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