History
There are more than five decades of research behind the HCM. The first edition of the Highway Capacity Manual was released in 1950 and contained 147 pages broken apart into eight parts. It was the result of a collaborative effort between the Transportation Research Board (TRB) and the Bureau of Public Roads, predecessor to the Federal Highway Administration.
The following editions were published by the Transportation Research Board in 1965, 1985, 2000 and 2010. The latest edition HCM 2010 is the culmination of a multiagency effort—including TRB, American Association of State Highway and Transportation Officials (AASHTO), and Federal Highway Administration—over many years to meet the changing analytical needs and to provide contemporary evaluation tools. The fifth edition, HCM 2010, has been released and is available from TRB.
Read more about this topic: Highway Capacity Manual
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