Os penderfynir bwrw ymlaen â'r prosiect, gallai'r gwaith adeiladu ddechrau tua diwedd y flwyddyn a gallai'r darn newydd o'r briffordd fod yn agored erbyn diwedd 2023.
If the decision is made to go ahead with the project, construction could start around the end of this year and the new section of motorway could be open by the end of 2023.