This just now from Cardiff Council:
We met with the Network Management Team early this morning regarding the road works on Llantrisant Road. As you know, the current traffic delays are entirely due to the temporary traffic lights - installed for the necessary drainage works - required on a 24/7 basis in support of your development.
The traffic management is being monitored on a daily basis and particularly during peak times. We too are naturally keen to keep any disruption to an absolute minimum and it is unfortunate that problems were exacerbated earlier today because of a broken down car. That said, and to assist, we are now proposing a modified plan to include an additional temporary traffic control unit on Llantrisant Road – placed further back on the southbound access leg to the roundabout junction with Heol Isaf. It is considered that this will allow more opportunity for Heol Isaf traffic to the egress onto Llantrisant Road (a.m. peak), in a more orderly and equitable way.
We plan to test this alternative modification tomorrow morning and our respective colleagues are putting this into action immediately.