The Highway Capacity Manual (HCM) is the most widely used reference material for different transportation and planning analyses. ITRE has been closely involved in developing and updating new versions of this manual. In addition to aiding the updating of HCM methodology, ITRE has taken the lead in developing, maintaining, and updating required computational engines (e.g. FREEVAL and STREETVAL) for the HCM. Software developed by ITRE was the first HCM-based software to include Freeway Work Zone, Managed Lane and Reliability analysis. ITRE provides training and support packages for different types of analyses within the HCM ranging from methodological consultation to modifications to the computational engines.