W W Gill in Manx Scrapbook vol1 chapter 3 discusses many early Manx roads. Quayle describes their state in 1812; see also Mountain Roads
see under B65 in Cubbon's Bibliography
Old Roads. In Feltham's Tour, 1798. Manx Soc. vi, 47; 117.
Ancient Roads and Bridges. In Oswald's Vestigia. Manx Soc. v. 100-2. 1860.
Highways and Bridges : Acts relating thereto. In Sir James Gell's Abstract of Laws. Manx Soc. xii, 237-9.
Highways and Bridges. In A. W, M. Hist. pp. 446-8; 632-6; 722-3.