I didn't see anything spectacular about their traffic management. Jon's and the old mulcaire are and were much better civil contractors.My reference to excellent is how they managed to construct that Interchange considering the levels of live traffic, the railway line and the water down there.
They would have built it to whatever specification they were given, so if there is a design issue, it is not Sisks doing.
Agree about design. They are blameless.
Trucks going through the tunnel are naturally keeping left,solid white linen the tunnel means you can't move right until exiting and make the dublin turnoff. I've seen them veer across the traffic to make it and its lethal.
Ultimately they will have to put sold markers in the middle approaching the tunnel thus forcing the decision early.