As Highways Authority for the motorway and trunk road network in Wales, Welsh Ministers must maintain them at public expense and comply with other regulations.
Fel yr Awdurdod Priffyrdd ar gyfer y rhwydwaith traffyrdd a chefnffyrdd yng Nghymru, rhaid i Weinidogion Cymru eu cynnal a'u cadw ag arian cyhoeddus a chydymffurfio â rheoliadau eraill.