Mae Llywodraeth Cymru, drwy Asiant Cefnffyrdd Gogledd a Chanolbarth Cymru, wedi comisiynu Mott MacDonald a'u partneriaid Richards, Morehead & Laing i edrych ar yr opsiynau ar gyfer gwella.
The Welsh Government, through the North and Mid Wales Trunk Road Agent, has commissioned Mott MacDonald and their partners Richards, Morehead & Laing to examine the improvement options.