Sad git award to me I afraid, just Googled it and I know what it is. I wont post the answer just yet....
...sod it! oh yes I will...
Its the Wild Atlantic Way
The account I found says...
The Wild Atlantic Way winds its way along the coastline of Ireland through its green valleys and wild coastline. The zig zag lines indicate a constantly changing direction. In the case of Kerry, following the coastline along the west of Ireland and the Atlantic sea.
Edit.
just found an article saying locals don’t get it themselves because there is no W in Irish. Tourists know. Hungarians don’t know, no W either.
Sounds about right