Cafodd y Comisiwn ei sefydlu gan Weinidog  yr Economi a Thrafnidiaeth yn sgil penderfyniad y Prif Weinidog i beidio ag adeiladu Ffordd Liniaru'r M4.
The Commission was established by the Minister for Economy and Transport following the decision by the First Minister of Wales not to proceed with the M4 Relief Road.