Sign up now to gain access to all the features of this free website. Already registered? Please log in.

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.

Subforum Latest Activity  
Technical Support

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

RE: Unable to download Supplemental 28
by Ian Johnson
General Discussion

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

Determining the correct value of LCʀʀ
by Henrique Marques
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.

Approach grades at signalized intersections
by Steve Tarabokija