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Sub-base reinstatement (S6.2)


Permitted options are shown in Figures A3.6, A4.5 and A4.6, subject to the following exceptions:
  1. Sub-base equivalence: thickness of granular sub-bases may be reduced provided that the thickness of the bituminous binder course is increased proportionately, in accordance with S6.3.7.
  2. Small openings and narrow trenches: in composite roads with a CBGM base, this material may also be used as a sub-base regardless of whether the existing sub-base is cement bound.