If you pass through Dublin's Port Tunnel in less than 3 and a half minutes this morning, you're going to get a fine and penalty points.
New speed cameras came into force at midnight last night.
The new permanent Average Speed Cameras at either end of the tunnel will calculate the time taken by each vehicle in the tunnel and any speeding motorists will automatically be penalised.
The operators of the Port Tunnel found that 58% of motorists using it exceed the 80km/hr speed limit.
