Numerous authors have conjectured that the structure was a road that continued past Lease Rigg all the way to Roman coastal fortifications or signal stations somewhere near Whitby, but this is debated. Drake reports in 1736 that an associate had followed its course from Wheeldale Moor to the coast at Dunsley Bay. Still, Codrington is dismissive of his account, and whether the author meant to imply that a visible structure had been followed, or simply that the associate had followed a proposed route without encountering it, is unclear. In either case, the author did not verify sight of the structure along this course himself. Several sources after 1805 report the same endpoint for the road, but it is unclear whether they are echoing Drake or had visited the site themselves. Several authorities state that any termini beyond Lease Rigg are "doubtful" and "unproven", and Elgee states that the causeway's northern course "is obscure and its termination unknown". Hayes and Rutter in 1964 found no evidence for a continuation of the structure any further north than Lease Rigg. Other authorities argue for possible courses extending northwards to Goldsborough, Guisborough, or Sandsend Bay.