Welcome to the HCQS

The Highway Capacity and Quality of Service (HCQS) Committee (AHB40) is concerned with investigating the physical and non-physical factors which affect capacity, traffic flow, comfort, convenience, and safety; and is responsible for developing computational techniques for quantifying the effect of these factors on capacity, traffic flow; and quality of service.

6th Edition of HCM "A Guide for Multi Modal Mobility Analysis" Is Now Available! 

The 6th edition of  Highway Capacity Manual "A Guide for Multi Modal Mobility Analysis" has been released. It is accessible via this link: http://www.trb.org/publications/hcm6e.aspx


The Committee & Subcommittee Working Websites 

This site will display committee meetings, The Highway Capacity Manual (HCM) information, and store the official roster for the full committee. For all other matters, including HCM Changes and Corrections, subcommittees, discussion, and announcements, please visit the:

Become a Friend of Committee

You can become a friend of committee by going to the following link: