U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
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.