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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.
HSS is included within HCS 2022, which is a separate installation and does not automatically uninstall previous versions.
Yes. The current version of HSS is a complimentary software for now, which means it is installed along with the latest version of HCS.
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.
No issues have been discovered in testing or reported by users.
- 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.