HSS is distributed along with HCS latest version as an office license that includes technical support (automatic updates, downloadable updates, toll-free telephone assistance, data file review, etc.) for the first year. Thereafter, an annual support subscription must be maintained to continue these services, but no more upgrade fees are required.
Open the Command Prompt and type ‘Highway Safety Software’. Alternatively, you can access HSS through the “HSS” tab in the HCS main menu. If you have the latest version of HCS and HSS was not installed, please contact our support via emailing firstname.lastname@example.org or call 800-226-1013.
HSS is a typical Windows installation and the system should meet the following minimum requirements including Windows XP/Vista/7 or newer, 512MB RAM, VGA+ Monitor and 750 MB hard drive space available. This will be a completely new installation, separate from any existing version. The installation program will present a license agreement, which must be agreed to for the installation to proceed.
The Highway Safety Software (HSS) implements Crash Prediction Models from Highway Safety Manual (HSM) 1st edition and the HSM Supplement, as well as NCHRP project 17-70, which means the following chapters are included:
Chapter 10 – Rural Two-Lane, Two-Way Roads
Chapter 11 – Rural Multilane Highways
Chapter 12 – Urban and Suburban Arterials
Chapter 18 – Freeways
Chapter 19 – Ramps
NCHRP Project 17-70 – Roundabouts
HSS is designed to determine the predicted and expected number of crashes for segments and intersections following the Predictive Method, which is explained in the aforementioned HSM chapters. The basis of the Predictive Method is calculating a Safety Performance Function (SPF) and applying Crash Modification Factors (CMFs) based on certain geometric and safety feature data in the intersection/segment. Whenever Historical Crash data is available, HSS allows Empirical Bayes method implementation.