Welsh Government is responsible for all trunk roads in Wales, the maintenance and operation of which is delegated to Local Authority Trunk Road Agents.

In 2005/6, following a review of trunk road services in Wales, three Trunk Road Agencies were established to replace the previous eight. The 3 new Trunk Road Agencies covered North, Mid and South Wales respectively.

Following a further review, in April 2012 two new Agencies replaced the former three. The two new Agencies are:

  • The North & Mid Wales Trunk Road Agent (NMWTRA)
  • The South Wales Trunk Road Agent (SWTRA)