Abstract
The FHWA's Interactive Highway Safety Design Model (IHSDM) is a suite of software analysis tools for evaluating safety and operational effects of geometric design decisions on 2-lane rural highways. IHSDM will provide highway project planners, designers, and reviewers in state and local departments of transportation and engineering consulting firms with a suite of safety evaluation tools to support these assessments. This article gives an overview of the 2003 release of IHSDM, which highway project decisionmakers now can use to check designs for conformance with design policy, estimate their expected safety performance, and diagnose potential safety and operational issues throughout the highway design process.