Each layer is given a Structural Number, and the total of the Structural Numbers of each layer in the system must exceed the required Structural Number derived from the loading conditions.Ĭompleting the Structural Number calculations can be tedious, particularly where the loading conditions are uncertain or where the pavement design must be optimised. The AASHTO 1993 method evaluates the structural strength contribution of each layer in the pavement system based on its thickness and stiffness. This takes the form of an overall Structural Number. This empirical equation is used to determine the total structural strength required to resist the proposed traffic loads. The AASHTO 1993 method is based on an empirical equation developed from road performance information gathered from the AASHTO Road Test. Flexible pavement design according to the AASHTO 1993 guide can be very time consuming.
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