Publication Details

Updated and regional calibration factors for Highway Safety Manual crash prediction models

Type: Paper

Subtype: Final report

Author(s): Smith, Sarah; Carter, Daniel L.; Srinivasan, Raghavan

Pages: 58

Publisher: North Carolina Department of Transportation

Url: https://trid.trb.org/View/1679114

Publication Date: Feb-2017

Number: FHWA/NC/2016-09

Address: Raleigh, NC

Abstract: 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.