![]() Due to the high cost and time required to collect segment-specific truck loading data, the majority of MEPDG designs and analyses are expected to rely on default axle loading values. The MEPDG requires detailed axle loading information in the form of normalized axle load spectra (NALS), number of axles per truck class and axle group types, and axle spacing inputs. The research quality weigh-in-motion (WIM) data from the LTPP Specific Pavement Study (SPS) Traffic Data Collection Pooled-Fund Study was used to develop improved global default axle loading values. LTPP Newsletter Volume 8, Issue 1 Fall 2012 Developing New MEPDG Default Traffic Datasets Using Research Quality Traffic Data The Long-Term Pavement Performance (LTPP) program has evaluated the applicability and identified the limitations of the existing Mechanical-Empirical Pavement Design Guide (MEPDG) global traffic loading defaults.
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