This is a togher, the Irish term for a causeway or trackway laid across wet ground, and the example recorded at Ards is a quietly remarkable piece of early engineering. Running for roughly 202 metres, less than a metre wide, it was built not from a single type of timber but from a combination of single longitudinal planks, closely packed split timbers, roundwood, and brushwood, with evidence of a substructure beneath in places, suggesting its builders understood that the surface alone would not hold without something firmer underneath.

The construction reflects a practical intelligence about the landscape rather than any grand ambition. Bogs were not simply obstacles in early Ireland; they were also boundaries, refuges, and, when crossed by a togher, routes that connected communities across otherwise impassable ground. The Ards togher ran on a broadly north-west to south-east orientation, suggesting it was threading a deliberate line between two points rather than wandering. One of the surviving planks measured 1.9 metres by 0.32 metres, a substantial piece of worked timber that speaks to the effort involved in sourcing, preparing, and placing materials in a waterlogged environment. The brushwood and roundwood elements are typical of class 1 toghers, where builders layered different materials to distribute weight and resist sinking, a technique found at sites across the Irish midlands, where bogs are deep and the need for reliable crossing routes was acute.