The work will provide a new dual carriageway and maintain connection across the new dual carriageway at Pentwyn Cynon, Afon Cynon, Court Farm and the Vale of Neath.
Bydd y gwaith yn darparu ffordd ddeuol newydd a chynnal cysylltiad ar draws y ffordd ddeuol newydd ym Mhen-twyn Cynon, Afon Cynon, Court Farm a Chwm Nedd.