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Welcome to the online edition of the Highway Capacity Manual.

The Transportation Research Board's (TRB) fifth edition of the Highway Capacity Manual (HCM 2010), incorporates results from more than $5 million of research completed since the publication of the HCM2000. This latest edition significantly updates the methodologies that engineers and planners use to assess the traffic and environmental effects of highway projects.

HCM 2010 introduces several firsts, including:

  • An integrated multimodal approach to the analysis and evaluation of urban streets from the points of view of automobile drivers, transit passengers, bicyclists, and pedestrians;
  • Guidance on the proper application of microsimulation analysis and the evaluation of those results;
  • The presentation of active traffic management in relation to demand and capacity; and
  • Generalized service volume tables to assist planners in sizing roadway facilities.

The TRB Highway Capacity and Quality of Service Committee invites users of the manual who are interested in improving the profession?s understanding of highway capacity and quality of service analysis to participate in the committee deliberations and to provide feedback about the HCM2010 methods. The committee website, www.AHB40.org, will be available for these interactions.

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