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What is Highway Capacity Manual Volume 4?

The HCM includes three printed volumes (Volumes 1-3) that can be purchased from the Transportation Research Board in print and electronic formats. Volume 4 is a free online resource that supports the rest of the manual. It includes:

Who Can Access HCM Volume 4?

HCM Volume 4 is free to everyone, but registration is required. Sign up now to take advantage of these resources and join the discussion!