Pa asesiad y mae Llywodraeth Cymru wedi'i wneud o gynnydd mewn tagfeydd traffig ar yr M4 o ganlyniad i newidiadau i'r A48?
Wedi'i ateb gan Y Dirprwy Weinidog Newid Hinsawdd | Wedi'i ateb ar 17/02/2022
In parallel to engagement with the public, transport appraisal is underway using a detailed traffic model, which will look at the impacts of each option on the A48 and the wider network (including the M4). These impacts, alongside other assessment information and feedback from the public, will be considered jointly by Cardiff and Newport Councils and Welsh Government to decide next steps.