Construction
Between the two towns are two prominent and intervisible high points: Cottington's Hill, from which Silchester can be seen, and Quarley Hill, from which Old Sarum can be seen. It is likely that these two high points provided the necessary locations for surveying the road. A section of the road in excellent preservation was carefully examined close to the Amesbury branch railway where the agger is very clear. In the construction the surface soil had been cleared away, and a layer of chalk rubble laid down and cambered to give a thickness of 18 cm at the centre. Upon this was a layer of large flints, 7.5–10 cm thick, which was topped with a layer of local gravel 30 cm thick and well cambered. There were V-shaped ditches on each side of the road 9.75 m from the south kerb and 10.45 m from the north kerb, making a total width for the road zone of 25.75 m to the ditch centres.
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