Check out some great books and help the site! I have chosen these books as among the best to illustrate this subject.
Main Roman roads and towns of Monmouthshire - Sir Fynwy
Only the main roads and towns, along with other places have been reproduced here
Green roads - The course of this road is known
Red roads - The course of this road is uncertain
Where the county name appears in bold, the relevant page opens in a new window
Where a county is not shown, this is either for the sake of clarity, or the Romans did not build a major road in that county