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The primary advantage of the modern procedures is that they are inherently better suited to treat the variety of environmental and wheel loading conditions than their state of-the-practice counterparts (including the 1993 AASHTO Guide). These procedures can
have several other important advantages, including
•Better capability to characterize material properties and assess existing pavement
structural capacity (through laboratory testing, nondestructive testing, and backcalculation, or all three);
•Ability to evaluate and compare different design alternatives on a fair (defensible)
basis; and
•Ability to account rigorously for stochastic variability or uncertainty in the design
process.
The primary disadvantage of the modern procedures (as reported by the users) is that
they tend to be more complicated, time-consuming, and costly to apply.
The philosophy of M-E-based design for flexible pavements has been around for roughly half a century; however, it is only in the last decade that full-fledged procedures that could be used outside the academic or research environment have been developed. NCHRP
Project 10-26, titled Calibrated Mechanistic Structural Analysis Procedures for
Pavements, completed in 1990 (1), helped usher in a whole new era of advancing the state of the art in pavement design technology. The best examples of some of the new M-E-based procedures used by the states are those that have been developed for the Washington State Department of Transportation (WSDOT) (2) and the Minnesota Department of Transportation (MnDOT) (3). The WSDOT procedure has been incorporated into a series of design manuals, Microsoft Windows-based computer programs (EVER series software), and supporting documentation that have been accepted and now are routinely used by all six district offices within the state. The documented first version was completed in 1989, but WSDOT had implemented the procedure several years before that date. However, the software has undergone several enhancements since then. The MnDOT ROADENT procedure is a research edition that was also incorporated into a Microsoft Windows-based software package. The first version of ROADENT was completed in 1998 and is now undergoing beta testing and trial implementation.