Starting from the Luffany Roundabout in the civil parish of Rathpatrick, it runs south and south-east for 3.6 km and is a "typically Irish" WS2 with hard shoulders. Given its destination the N29 is, not surprisingly, chiefly used by HGVs. The first 700 m or so of the road follow the former, pre-bypass alignment of the N25, branching off at the Slieverue Roundabout (the onward road is now the R711). Before construction of the latter roundabout the port road diverged at a T-junction some 250 m further SSW.
Shortly before arriving at its terminus the route passes (on the right, at Gorteens) the ruins of a four-storey gatehouse belonging to a vanished late-medieval castle.