The edges of all excavations in rigid roads except large diameter cores (see S7.4) must comply with:
The use of edge taper support is only permitted in road categories 3 and 4. It may be used in road category 2 by agreement with the authority. If this method is used, S7.5.2 and S7.5.3 must be followed.
For road categories 0 and 1, dowel bars must be used as per S7.5.5 to S7.5.11. For road category 2, dowels must be used unless otherwise agreed with the authority.