FHWA Releases 2015 Version Of Interactive Highway Safety Design Model

On March 4, 2015, the Federal Highway Administration (FHWA) released version 10.1.0 of the Interactive Highway Safety Design Model (IHSDM), a suite of software analysis tools for evaluating safety and operational effects of geometric design decisions. The new version includes a Crash Prediction Module (CPM) that provides a faithful implementation of the American Association of State Highway and Transportation Officials Highway Safety Manual (HSM), Part C: Predictive Method. It includes crash prediction capabilities for freeway segments and freeway ramps, collector-distributor (C-D) roads, and ramp terminals, which implement HSM 2014 Supplement methods. The CPM also covers two-lane rural highways, multilane rural highways, and urban and suburban arterials. Another highlight of the CPM is the Calibration Utility, which is part of the IHSDM Administration Tool (Admin Tool). The Calibration Utility, intended to assist agencies in implementing calibration procedures described in the Appendix to Part C of HSM, features step-by-step instructions and hands-on exercises illustrated in a tutorial lesson. IHSDM includes five other evaluation modules applicable to rural two-lane highways: policy review, design consistency, intersection review, traffic analysis, and driver/vehicle.

The software is available for free download at www.ihsdm.org. For more information, please contact Clayton Chen, 202–493–3054, clayton.chen@dot.gov.