Weren’t average speed cameras tested during a temporary 60k zone during roadworks on m7 around Newbridge, Kildare last year. I don’t think they were used for prosecutions but they should be for road works.
Longer tunnel, and straighter. DPT allows overtaking also, although of course it's considerably longer again.
Heard stories of that but no actual accounts of anyone being caught. Drove through it once at the time and didn't see any sign of actual cameras.
This time around I'm driving it every day and the 60km/h limit is there but so far not being enforced at all.
Theres permanant ones on the route between Holywood and Bangor. 50mph zone and funny enough its mostly too twisty and has loads of traffic lights so they're kinda wasted.
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Can you nearly see light from the other side as soon as you enter? That makes it an underpass!
But in answer to your question OP, its only the Port Tunnel that has them cameras.
I was going through the JLT one morning last week at about 7.15 am so just getting busy. I was side by side with another truck and some loon on a motorbike flew down between us flat out!
I wish they could fine the dopes chopping and changing lanes in the Tunnel when they know they are in the wrong lane....
I'd be keener on a lane change camera in the JLT,