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(July, 77)of 120 aim with surfacing 90 mm thick or a lean concrete roadbasethickness of 180 mm with surfacing 100 mm thick, A rigidpavement with 30 years design life requires a sub-base thicknessof 80 mm with a concrete slab 220 mm thick. Figure V*7«9illustrates suitable flexible and rigid designs for such anurban trunk road at item 8«Similar considerations apply to the other types of road inboth urban and rural road hierarchies, and characteristic designsfor these are also given in Figure V«7«9* with design assumptionsand details summarised in Table 7«3

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