Highway Capacity Manual

Getting Support

Click here [please note: old link] to jump to the TRB Highway Capacity Manual webboard. This interactive system puts you in contact with other HCM users, and the authors of the HCM.

How to Order

The HCM2000 can be ordered electronically from the TRB bookstore. Here are some quick instructions to get there quickly:

  1. Go to the "TRB Bookstore":http://trb.org/bookstore/
  2. Enter the code "HCM2" into the search box

You will be presented with several purchase options. Good luck!

Updates and Changes

As often as necessary to ensure the quality of the HCM, errata and other changes will be electronically posted.

Summary of Adopted Changes Addendum - November 2007 9.0 megabytes, uploaded 2 months ago

Summary of Adopted Changes - November 2007 87 kilobytes, uploaded 2 months ago

The Highway Capacity Manual (HCM) contains concepts, guidelines, and computational procedures for computing the capacity and quality of service of various highway facilities, including freeways, signalized and unsignalized intersections, rural highways, and the effects of transit, pedestrians, and bicycles on the performance of these systems.