A cropmark, the faint discolouration that buried features can produce in growing vegetation by altering soil drainage and moisture, traces a roadway roughly 340 metres long across the flat alluvial ground near Moyeady. It appears as two parallel lines, set somewhere between five and ten metres apart, representing what were most likely drainage ditches flanking an earlier carriageway.

The road diverges from the modern N80 at its southern end, swinging away on a more northerly course before presumably rejoining the main alignment further along. The significance of that divergence lies in what it tells us about the history of road engineering in the area. The 1835 edition of the Ordnance Survey six-inch map shows the N80's predecessor already following its current line, which means this earlier route predates that survey and was already abandoned, or at least superseded, by the early nineteenth century. Roads on flood-plains are particularly prone to incremental realignment as engineers sought drier or more stable ground, and it is likely that the present course of the N80 represents just such a pragmatic adjustment. The cropmark was first spotted by Simon Dowling on a Google Earth image captured in July 2018, a reminder that aerial photography, even the freely available kind, continues to surface features that centuries of foot traffic and cartography had quietly forgotten.