and construction Margary concluded that four main alignments were used for the road as far as the South Downs, with local diversions from them to ease gradients and avoid wet ground. From London these were (1) Streatham to Croydon, (2) Godstone Hill to Blindley Heath, (3) Rowlands Farm, Lingfield, to Hophurst Farm, Felbridge, (4) Selsfield Common to Clayton Hill. Flint and gravel were used through the North Downs and from Burgess Hill to the South Downs, with slag from the Wealden iron industry used extensively for the middle sections, sometimes mixed with sandstone and sometimes as a solid mass. In other parts of the Weald local sandstone alone was used. Margary number Ivan Margary gave the road the Margary number 150 in his identification system. Route Kennington to Croydon The road branched from Stane Street at or near Kennington Park and has become the line of the modern A23 road for several miles through south London, followed by Brixton Road, Brixton Hill, Streatham Hill, Streatham High Road and London Road, Streatham, then the A235 road on London Road nearer to Croydon. Streatham takes its name from the Roman road and Brixton Hill was formerly named Brixton Causeway, causeway being a term often used for old Roman roads. At Hepworth Road at Norbury, where the modern road wanders from the Roman line, the intact road, 32 feet wide, was excavated in 1961 and remnants of a metalled ford across the stream were found further south at Hermitage Bridge on the River Graveney. Croydon The line of the road through what is now the heavily built-up town of Croydon is debated. There are two main possibilities: that it followed the line of the modern (late-medieval/post-medieval) high road (London Road – North End – High Street – South End – Brighton Road); or that it followed a more westerly course through Old Town. Margary argued for the Old Town route, stating that south of Thornton Heath, at Broad Green Avenue, a slight alignment change took the Roman road west of London Road along Handcroft Road, part of Gardeners Road and Pitlake. Before the area was built over Owen Manning and William Bray noted this route in their History and Antiquities of the County of Surrey (1814), saying that the line "took its course by Old Croydon and the West side of Broad Green where it is still visible". Further possible support to the