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Discussion Forum

This area is intended for interaction among HCM users to exchange information and ideas on applying HCM procedures. When issues rise to the level that requires formal response from the TRB Committee on Highway Capacity and Quality of Service, they should be submitted for Interpretation Request.

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General Discussion

General questions, applications, and questions regarding the HCM 6th Edition

Questions & Clarifications

Having trouble with something in the HCM 6th Edition? Need further information to clarify a position? Conversations here will help create the ongoing errata for the manual found in the Interpretations page on this website.

RE: How is Adjusted Flow Rate Calculated?
by Bill Sampson
Technical Support

Run into problems with the website? Have a suggestion? Let us know here!

RE: Streetval Expired June 30, 2017
by Paul Ryus