The Sussex Greensand Way is a Roman road linking the London to Lewes Way at Barcombe Mills to Stane Street at Hardham. The road, which has almost entirely fallen out of use, follows the free draining ridge of greensand which lies north of the South Downs. It is a planned route rather than a Romanised iron age track, following a few straight alignments without any steep gradients, which linked various north-south roads and tracks. A number of important Roman villas and their farming estates were linked by the road. It is not known at what time during the Roman period the road was built.
Branching from the London to Eastbourne area Roman road at Barcombe Mills north of Lewes (50°55′09″N 0°00′08″W / 50.9191°N 0.0022°W), the road runs west through East Chiltington and past the south side of Plumpton Racecourse, where the agger can be seen beside the lane, to Streat, a Saxon placename indicative of a Roman road. Passing north of Ditchling and through Keymer it crosses the London to Brighton Way Roman road at Hassocks, where there was a Roman cemetery. West of Hassocks the road turns a little to the south, passing through Bedlam Street south of Hurstpierpoint where it briefly runs on a prominent agger alongside and then crosses the B2117, and continues past Woodmancote to Woods Mill, with short sections under or adjacent to the Woods Mill to Woodmancote road. The road then runs across the River Adur floodplain, where the Adur was bridged on wooden piles close to Stretham Manor. From the river the road runs west to the moated Buncton Manor Farm where it turns north west to West Chiltington and crosses the River Arun floodplain to join Stane Street at Hardham (50°56′47″N 0°32′10″W / 50.9463°N 0.5362°W). Remains of a Roman bath house have been found east of the junction and there was a posting station or Mansio on Stane Street at Hardham.