This is a well marked route that passes through Kent, Surrey, north east Hampshire and into Sussex.  There is a race along the full (105km) length of the Serpent Trail each year since 2017, and course records are the supported FKTs for this trail.  See the race website.

Explore the heathlands of the South Downs by following the 64 mile long Serpent Trail.

A traverse of Los Padres National Forest from Cuyama/Ventucopa to Upper Oso Campground (outside of Santa Barbara). The route starts at the last gate at the entrance to the Dick Smith Wilderness on Forest Route 9N11. It follows this road until it turns into Buckhorn Road, which it follows until Buckhorn Road terminates at Upper Oso Campground, where there is a gate as the road turns into Camuesa Canyon Road. This is the path of least resistance, following a fire road with no major turns for the entire traverse.