It is a togher, the Irish term for a road or causeway built across wet ground, and this particular example is classed as a type 3, a category that refers to the construction method used to keep travellers out of the mire.

Toghers were Ireland's solution to a landscape that was, for much of prehistory and the early medieval period, threaded with impassable bog. Builders laid wood, brushwood, or other organic material directly onto the soft ground, creating a surface firm enough to walk or carry loads across. The bog, which would have swallowed an ordinary road, instead preserved it, sealing the timber in cold, airless, acidic conditions that can hold organic material for thousands of years. The Annaghbeg togher was recorded during a field survey in 1988 and is cited in Barry Raftery's 1990 work on Irish trackways, where it appears alongside comparable examples from across the Irish midlands.