For nearly 60 years, the Highway Capacity Manual (HCM) has been a standard reference for traffic engineers and planners in the USA. The next edition of the HCM will be published in 2010 and will contain a number of significant format and content changes. In terms of format, the 2010 HCM is planned to be released as three printed volumes—Concepts, Uninterrupted Flow, and Interrupted Flow—plus an electronic Volume 4 that will contain supplemental material, the HCM Applications Guide, and a Technical Reference Library containing the original research that led to the current HCM methodologies. The overall page count of the three printed volumes will be no greater than the current HCM2000. In terms of content, the 2010 HCM will incorporate the results of over $5 million in funded research focused on HCM methodologies, including significant updates to the signalized intersections, roundabouts, urban streets, interchange ramp terminals, and weaving methodologies. The 2010 HCM will emphasize multimodal analysis, with pedestrian, bicycle, and transit level-of-service (LOS) procedures presented, where appropriate, alongside the automobile LOS procedures. In recognition of the widespread use of software to perform traffic analyses, the HCM printed text will focus on explaining what each methodology does and how to critically interpret the results, with the supplemental material in Volume 4 providing the step-by-step details. Finally, a significant amount of material is being added that provides guidance on using simulation and other alternative tools to supplement HCM analyses. Lee Rodegerdts is an Associate Engineer with Kittelson & Associates, Inc. in their Portland, Oregon, USA office. He has 16 years of broad experience in traffic operations, traffic design, transport planning, and transport research and education throughout North America with specialties in roundabouts and traffic signal operations. Lee is a member of the production team to produce the 2010 Edition of the U.S. Highway Capacity Manual and is also leading efforts to update FHWA's Roundabouts: An Informational Guide. He serves on the Transportation Research Board’s Committee on Highway Capacity and Quality of Service as its chair of the subcommittee on unsignalized intersections. He is also a member of the TRB Task Force on Roundabouts and the roundabout task force of the National Committee on Uniform Traffic Control Devices. He is a registered civil engineer in Oregon and twelve other U.S. states.