What technical user support is available?
FHWA’s Geometric Design Laboratory (GDL) at the Turner-Fairbank Highway Research Center provides technical support free of charge for IHSDM users. The GDL’s transportation and software engineers researched, developed, and tested IHSDM, and have intimate knowledge of this resource. To request technical support, either telephone the IHSDM Help Line at (202) 493-3407, or send an e-mail to IHSDM.Support@fhwa.dot.gov.