United States Department of Transportation
i
Traffic load spectra for implementing and using the mechanistic-empirical pavement design guide in Georgia.
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2014-02-01
[PDF-5.96 MB]
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Abstract:The GDOT is preparing for implementation of the Mechanistic-Empirical Pavement Design
Guide (MEPDG). As part of this preparation, a statewide traffic load spectra program is being
developed for gathering truck axle loading data. This final report presents the results of a
comprehensive research effort that culminated in recommendations for a statewide Traffic Load
Spectra Program for collecting and processing truck axle loading data to support MEPDG
implementation in Georgia. The recommendations include an optimal axle loading data collection
plan that balances pavement design data needs, cost and number of WIM sites, and types of
equipment used in obtaining the data. The report also shows how the available GDOT traffic data
and other applicable data resources were used to develop traffic loading inputs and defaults to
support local calibration of MEPDG models in Georgia. The available axle loading data were
analyzed and the interim traffic loading defaults were developed for different groups of roads
designed and maintained by GDOT, along with the recommendations for future updates of the
defaults. In addition, user guidelines, decision trees, and software tools were developed to
facilitate using the traffic loading defaults in MEPDG applications.
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