This section of the road was first constructed in 1819 by the Sheffield & Chapel-en-le-Frith Turnpike Company using spoil from the nearby Odin Mine. It replaced a much earlier, ancient packhorse route, running through the Winnats Pass. Also known locally as The New Road, the new section was set at an easier gradient than the earlier Winnats Pass route and crossed the Mam Tor landslide. As a result of further movement of the Mam Tor landslip, major road works were required in 1912, 1933, 1946, 1952 and 1966. On the last occasion, the road was closed for six weeks. In 1974 large parts of the Mam Tor section collapsed during a massive landslide. Additional road works were carried out regularly, when wet years led to further landslides. Finally, the Mam Tor section of the road was abandoned in 1979. Hereafter, traffic was routed through the Winnats Pass to rejoin the A625 at Windy Knoll.