CODE OF PRACTICE FOR SUBDIVISION AND DEVELOPMENT

Part 3 - RoadsTo obtain the 10-percentile value, collate CBR test results from samples taken at thesame level relative to the subgrade.Where CBR values are required for aggregates these shall be based on laboratorytests prepared on the fraction passing the 19 mm sieve.Subgrade improvement may be possible by re-compaction of the subgrade, chemicalstabilisation or removal and replacement of soft material.Aggregate requirements are presented in Table 3.5.TABLE 3.5: PAVEMENT AGGREGATE REQUIREMENTSRoad Type Traffic Volume Basecourse Type Sub-base TypeArterial Roads All AP40 GAP 65Collector Roads >2000 vpd AP40 GAP 652000 vpd AP40 GAP 65150-2000 vpd PAP40 GAP 65