An official website of the United States government
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
The Design Consistency Module (DCM) helps diagnose safety concerns at horizontal curves. Crashes on two-lane rural highways are over-represented at horizontal curves, and speed inconsistencies are a common contributing factor to crashes on curves. This module provides estimates of...
The Crash Prediction Module (CPM) includes an implementation of the crash prediction methods documented in part C of the American Association of State Highway and Transportation Officials’ (AASHTO) First Edition Highway Safety Manual (HSM). CPM includes capabilities to evaluate rural two-lane...
Click the link to download the IHSDM 2021 software release (version 17.0.0; September 2021).
The IHSDM—which supports the Federal Highway Administration's Data-...
The Highway Safety Design Manual (HSM) shares the Interactive Highway Safety Design Model’s (IHSDM’s) goal of providing quantitative safety analysis tools to decisionmakers.
The HSM is a Transportation Research Board (TRB) and...
The Interactive Highway Safety Design Model (IHSDM) suite of software analysis tools includes five evaluation modules and an Economic Analyses (EA) Tool:
The mission of the Geometric Design Laboratory (GDL) is to support the Office of Safety Research and Development in research related to the geometric design of roadways and the impacts on safety. The GDL provides technical support to develop, maintain, and...
Welcome to the Interactive Highway Safety Design Model (IHSDM) Frequently Asked Questions list. Here you will find the links to each section of the FAQ to help you download, install, and use this software.
To request user technical support, contact:
IHSDM Help Line: (202) 493-3407
IHSDM Support Email: IHSDM.Support@dot.gov
For other information about IHSDM, contact:
In-Kyu Lim
Office of Safety and Operations Research...
The goal of this research is to develop reliable estimates of the effectiveness of the safety and operational improvements identified by the ELCSI-PFS Advisory Committee (TAC). These estimates are determined by conducting scientifically rigorous before-and-after evaluations at...