The scheme is progressing through the Welsh Government Transport Appraisal Guidance (WelTAG) and is currently at the stage of identifying preferred options.
Mae’r cynllun wrthi’n mynd drwy’r camau yn Arweiniad Llywodraeth Cymru ar Arfarnu Trafnidiaeth Cymru (WelTAG) ac mae’r opsiynau a ffefrir y cael eu nodi ar hyn o bryd.