... tests were carried out in the Transport Research Laborator y s Pavement Test Facility at Crowthorne, Berkshire. Test roads consisted of a single layer of granular material placed on a Gault clay subgrade. The roads had base thicknesses of 200, 350 and 560 mm. Wheel loads of 44 and 80 kN were used...

...-6). The data for each geological unit are summarized in Table 1. The geological units are reviewedbelow in descending stratigraphical order. Gault Clay 15. Gault Clay was encountered in bore- holes, but yielded relatively few samples for testing. When exposedin cut, it occurred only in large shear...