There have been a lot of lanes going in around Dublin, and frankly, most of them are useless.
Some of them are grade separated from the main road by a inch high curb. Just high enough to catch a wheel and cause a wreck.
Most of them just collect road debris like the shoulders.
Some of them are de-facto parking lanes.
Some of them are confusing enough that it's seriously unclear what the lane actually means. (I say this as someone who had to go through the whole driver licensing scheme here after 20 yrs driving in the US, so I've seen all the rules from the POV of an experienced driver.)
For example: https://www.google.com/maps/@53.6089878,-6.1934201,90m/data=...
What the hell are those cycle turn boxes in the middle of the car lanes? They have a solid border, so they're 'mandatory'. They're unavoidable by cars. And if you're in one, you better have right of way already, because squishy. (and fwiw, the one other cyclist I saw at that junction was using the crosswalk).
And then there's the cycle lanes near Greystone where they exist for one block, then there's something that looks like a crosswalk for bikes, and they dissappear for a block, then they reappear again.
At some point, you just have to assume that some one with a can of paint is taking the piss and you just ride in a straight line like any other vehicle.