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More than 15 years have passed since the U.S. transportation industry started its transition from allowable stress design (ASD) to load and resistance factor design (LRFD). For geotechnical design, the AASHTO LRFD Bridge Design Specifications includes provisions that allow state departments of transportation (DOTs) to develop their own design methods and resistance factors.
The TRB National Cooperative Highway Research Program's NCHRP Synthesis 601: Practices for Local Calibration of LRFD Geotechnical Resistance Factors documents the extent to which state DOTs have developed agency-specific geotechnical design methods and resistance factors and also details the challenges of the development and benefits resulting from implementation of the methods.
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