Towards Derrynoose on the B3
The B33 was a short B-road in west County Armagh.
The road started on the B3 near Derrynoose, where that road turned off to aim for Clontibret. The B33 continued west from this point to end at the border at Bree, where the road ahead was the L145 (now R214).
The B33 was part of the shortest classified route between Newry and Monaghan and as such was more important than the original route of the B3. For this reason the B3 had been rerouted over the entire route of the B33 by the 1940s, making the B33 number redundant.