Mae’r rhwydwaith yn cael ei redeg, ei gynnal a’i gadw a’i wella ar ran Gweinidogion Cymru gan ddwy asiantaeth gyhoeddus.  Cyflogir staff Asiantaeth Cefnffyrdd y De gan Gyngor Sir Castell-nedd Port Talbot a staff Asiantaeth Cefnffyrdd y Gogledd a’r Canolbarth gan Gyngor Gwynedd.
The day to day operation, maintenance and improvement of the network is currently carried out on behalf of Welsh Ministers by two public sector agents. Staff in the South Wales Trunk Road Agent are employed by Neath Port Talbot County Borough Council.  Staff in the North and Mid Wales Trunk Road Agent are employed by Gwynedd County Council.