The first edition of the manual was published in 1950 by the (then) U.S.Bureau of Public Roads.In 1965 the second edition was completed under the guidance of the Highway Research Boards Committee on Highway Capacity.
Highway Capacity 2000 Manual Was PublishedThe 1965 manual added significant depth of material on freeways and signalized intersections. The 1985 SR209 HCM (third edition) was published by the Transportation Research Board (TRB). This edition répresented a significant stép forward for cápacity analysis ás it included thé results of moré than a dozén major funded résearch efforts. Highway Capacity 2000 Software For UseProbably the móst significant contribution óf the 1985 edition was that it led to the development of software for use in performing the calculations required by the procedures in the manual. Highway Capacity 2000 Update Is CurrentlyAnother update is currently being produced by TRB and is expected to be released in early 1998. This article discussés the production ánd content óf HCM 2000, the on-line version of HCM 2000, and the means for delivery of the three components of HCM 2000 and for their maintenance and updating. An insert with this article provides the HCM website address and a list of the information available, such as demographics of HCM users and link to information on NCHRP and TCRP projects related to the HCM.
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