HSS™ > Overview

Highway Safety Software (HSS™)

The Highway Safety Software (HSS) performs Crash Prediction evaluations in roadway facilities based on Highway Safety Manual (HSM). As presented in the HSM (©️ 2010 by the American Association of State Highway and Transportation Officials — AASHTO), the base model to predict crash frequency was built to take into account the local infrastructure and operational characteristics. For the various facility types, Safety Performance Functions (SPF) and the Crash Modification Factors (CMFs) are presented. An additional Calibration factor, Cr, can adjust the model for a condition other than the one for which it was developed.

The Highway Safety Software (HSS) faithfully implements the Predictive Method of AASHTO’s 1st Edition HSM and its supplement HSM 2014, allowing for local and state-level calibration for parameters. This release of the HSS includes updated modules to implement the Highway Safety Manual Predictive Models.

All facility types covered by the HSM can be modeled in HSS, including rural two-lane highways, rural multi-lane highways, urban/suburban arterials, freeway segments, and freeway ramps/interchanges, intersections, and roundabouts (NCHRP Project 17-70). HSS can conduct a standalone evaluation of an intersection or analyze corridors composed of a series of segments and intersections.

HSS is distributed as part of HCS. In order to access HSS, in the main windows of HCS, click on Tools-> Highway Safety Software. For any questions or inquiries, contact mctrans@ce.ufl.edu or call us at +1-800-226-1013.