theory is given by a title deed of the late 1280s, by which a piece of property, described as lying on the east side of the king's highway in Old Town, was sold by one "Andrew de Calceto in Croyndon", also named as "Andrew ate Causie", both forms of his name meaning "of/at the causeway", a term which implies a well constructed road. The modern A236 dual carriageway, which bypasses Croydon to the west, is named Roman Way in acknowledgement of this theory. A little further south, the road may have followed the line of Duppas Hill Terrace and Violet Lane. Against the Old Town theory is the fact that the area (lying in the headwaters of the River Wandle) would have been extremely marshy, and that it would have been more logical for the Roman engineers to have followed the higher and dryer ground, and straighter alignment, of the easterly High Street route. This route would also have avoided a steep climb up to Riddlesdown. There has been considerably more archaeological evidence for Roman activity around the line of the High Street route than around that of the Old Town route, but no clear evidence for the road. A compromise argument would see the road following the Old Town route as far as Duppas Hill, but then cutting across the Wandle valley to Riddlesdown. Croydon to Godstone South of Croydon the road passed through the Caterham Gap in the North Downs; this natural corridor has been heavily developed with modern roads and railways, along with suburban housing, obliterating much of the ancient road. The road can, however, be found east of Caterham where the road curves around the west side of Tillingdown on a terraceway, marking the boundary between developed and undeveloped land. A distinct metalled agger was found at the northern end, while on the terrace it was 25 ft wide and well metalled with flint to a maximum depth of 12 in. As is often the case with Roman roads a parish boundary follows the line. The Roman line joins the lower part of Tillingdown Lane, then the B2030 road and A22 Caterham Bypass before becoming a lane east of the A22 as it approaches the M25 motorway where the intersection is on the Roman line. Godstone to Felbridge South of junction 6 of the M25 motorway the Roman road has remained in use as the B2235