“Mae Llywodraeth Cymru wedi buddsoddi £40 miliwn o bunnoedd yn y gwaith hwn o wella’r twneli, ac rwy’n falch iawn bod y gwaith yn mynd rhagddo cystal.
“The Welsh Government has invested £40 million pounds in this current work to bring the tunnels up to standards and I’m delighted that the work is progressing so well.