Key factors concerning a rigid base
A rigid base means a concrete base.
Concrete is both strong and stiff but it is also flexible.
Both shallow setts and slabs require a strong tensile connection with a concrete base in order to resist heavy traffic loads.
Full setts benefit from having a concrete base, much greater traffic
loads can be supported, both from the increased stiffness provided by a
concrete base but also from the creation of a strong tensile connection
between the underside of the setts and the concrete.
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