The Interactive Highway Safety Design Model (IHSDM) is a suite of software analysis tools for evaluating the safety and operational effects of geometric design decisions on highways.
IHSDM is a decision-support tool. It provides estimates of a highway design's expected safety and operational performance and checks existing or proposed highway designs against relevant design policy values. Results of the IHSDM support decisionmaking in the highway design process. Intended users include highway project managers, designers, and traffic and safety reviewers in State and local highway agencies and in engineering consulting firms.
The IHSDM currently includes six evaluation modules (Crash Prediction, Design Consistency, Intersection Review, Policy Review, Traffic Analysis, and Driver/Vehicle). This Web site summarizes the capabilities and applications of the IHSDM evaluation modules. It also provides a library of the research reports documenting their development.
The IHSDM – HSM Predictive Method 2012 Release (version 8.1.0, February 2013) may be downloaded free of charge at http://www.ihsdm.org. User technical support is also available free of charge. An IHSDM Training Course is available through the Federal Highway Administration’s (FHWA’s) National Highway Institute.
Development of the IHSDM is coordinated with two related initiatives: the Highway Safety Manual, developed by the Transportation Research Board and published by the American Association of State Highway and Transportation Officials; and SafetyAnalyst, developed by FHWA and now available as AASHTOWare.