Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

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 latest general information on the Coronavirus Disease 2019 (COVID-19) is available on Coronavirus.gov. For USDOT specific COVID-19 resources, please visit our page.

United States Department of Transportation United States Department of Transportation
OFFICE OF RESEARCH, DEVELOPMENT, AND TECHNOLOGY AT THE TURNER-FAIRBANK HIGHWAY RESEARCH CENTER

Technical Support

IHSDM users may request technical support by contacting the IHSDM Help Line or by writing to the IHSDM Support email address. The IHSDM technical support staff works onsite in the Geometric Design Laboratory at the Federal Highway Administration Turner-Fairbank Highway Research Center. Technical support is free-of-charge to users.

IHSDM Help Line

Users may call the IHSDM Help Line at (202) 493–3407. The Help Line is monitored during normal business hours on weekdays, except for Federal Government holidays.

IHSDM Support Email

Users may contact the IHSDM technical support staff by sending an email to IHSDM.Support@dot.gov. Staff monitors this email account during normal business hours on weekdays, except for Federal Government holidays.

Last updated: Monday, December 2, 2019