Urban road scheme constructed in the early 1970s (see Buckland et al 1989). Within the area of Slater's (in Buckland et al 1989 43-61) plan unit Ib which describes an area within the boundaries of the Roman fort / Saxon Burh but to the south and east of the area of the Norman castle ditches. Slater considers narrow but irregularly planned plots shown on early maps and recorded in early 1970s excavations (particularly Buckland et al's 'Site DT' 1989, 170) to have been laid out between the abandonment of the castle for defensive purposes and the laying out of the Market Place plot series' to the south in the 1190s. Invisible legibility of earlier phases following road construction.