|Now part of:||R448, N78, N77, N76, N24, N8|
|Route outline (key)|
The T6 was the main trunk route from Dublin (via the T5) to Cork. It took a different route than the current main set of National Primary roads between the two cities, running via the old N9 before cutting across via Kilkenny and Cahir to what became the N8.
|Naas - Kilcullen||N9||R448|
|Kilcullen - Kilkenny||N78||R418, N78|
|Kilkenny - Clonmel||N76||N76|
|Clonmel - Cahir||N24||N24|
|Cahir - Cork||N8||R640, R913, R639, N73, R639, N8|