![]() The rest of this section will discuss the specific assumptions, inputs and outputs associated with the 1993 AASHTO Guide flexible pavement empirical design equation. This equation is not the only empirical equation available but it does give a good sense of what an empirical equation looks like, what factors it considers and how empirical observations are incorporated into an empirical equation. Structural Number (an index that is indicative of the total pavement thickness required)Ī 1D 1 + a 2D 2m 2 + a 3D 3m 3+…a i = ithlayer coefficientD i = i thlayer thickness (inches)m i = i th layer drainage coefficientĭifference between the initial design serviceability index, po, and the design terminal serviceability index, pt ![]() ![]() Predicted number of 80 kN (18,000 lb.) ESALsĬombined standard error of the traffic prediction and performance prediction
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