It is a togher, a timber trackway laid across wet or waterlogged terrain, and it belongs to a class of monument that tends to be forgotten precisely because it worked so well. Once the bog grew over it, it vanished, preserved in the anaerobic darkness that has kept similar structures intact for thousands of years across the Irish midlands and west.

Together are generally categorised by their construction. A class 2 togher typically involves split or hewn planks laid transversely across longitudinal runners, a more deliberate and labour-intensive form of trackway than the simpler brushwood or round-pole arrangements. They appear throughout Irish prehistory and into the early medieval period, and their presence in a given area usually signals something worth crossing a bog to reach, whether a settlement, a grazing ground, a ford, or a routeway that mattered enough to justify the considerable effort of engineering a path through waterlogged ground. In that sense, a togher is less a road than an argument, a community's insistence that a particular journey needed to be made reliably, repeatedly, and in all seasons. Killaderry sits in an area of County Galway where bog and pasture have long existed in close proximity, and the togher recorded there adds a quiet layer of depth to what might otherwise read as ordinary agricultural landscape.