Stane Street is the modern name of the 91 km-long Roman road in southern England that linked Londinium to Noviomagus Reginorum. The exact date of construction is uncertain; however, on the basis of archaeological artefacts discovered along the route, it was in use by 70 AD and may have been built in the first decade of the Roman occupation of Britain.
Stane Street shows clearly the engineering principles that the Romans used when building roads. A straight-line alignment from London Bridge to Chichester would have required steep crossings of the North Downs, Greensand Ridge and South Downs. The road was therefore designed to exploit a natural gap in the North Downs cut by the River Mole and to pass to the east of the high ground of Leith Hill, before following flatter land in the River Arun valley to Pulborough.
Wikipedia https://en.wikipedia.org/wiki/Stane_Street_(Chichester)
Coordinates 51°1'49.283" N -0°26'44.454" E