The overall objective was to estimate the calibration
factors for all the prediction models in Part C of the 1st edition
of the HSM that are of interest to NCDOT as well as calibration factors for
freeway models that are slated to be part of the next HSM based on the latest
six years of roadway, traffic, and crash data from North Carolina. For some of
the models, separate calibration factors were developed for the three different
regions in North Carolina (Coast, Mountain, and Piedmont). The project also
produced state-specific crash type proportions to be used along with the
calibration factors. For rural two lane roads, calibration functions were also
estimated. Roadway and crash data from 2010 to 2015 were used in this effort.
