Not a road in the modern sense, but a carefully engineered wooden trackway, a togher, intended to carry people across ground that would otherwise have swallowed them. The fact that it survived at all is down to the bog itself, which preserved the timber in its cold, airless, acidic layers for more than two thousand years until excavation brought it back into view.

The trackway at Killoran, in County Tipperary, measures 17.4 metres in length and 2.8 metres in width, wide enough to have accommodated livestock or laden travellers. Its construction follows a method that appears in other Iron Age togher sites across Ireland: alternating sections of longitudinal roundwood, lengths of timber laid along the direction of travel, combined with diagonal planks and roundwood laid across them. The result is a surface with both stability and a degree of flexibility, suited to ground that shifts and compresses underfoot. Radiocarbon dating places its use somewhere in the range of 367 to 195 BC, while dendrochronology, the science of dating timber by its tree rings, has produced more precise figures of 426 BC plus or minus nine years, and 322 BC plus or minus nine years. The two dates suggest either phased construction or repair over time, meaning this crossing may have served generations rather than a single moment of need. The research is documented by Stevens in 1999.