HIGHWAY CAPACITY MANUAL 2000

The Highway Capacity Manual (HCM) is approaching its 50th year of serving as the principal resource for the analysis of capacity and level of service of U.S. streets and highways. 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 Board's Committee on Highway Capacity. The 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 represented a significant step forward for capacity analysis as it included the results of more than a dozen major funded research efforts. It strengthened the concept of level of service; allowed for interim updates by appearing in looseleaf format; and was the first multimodal HCM, including chapters on transit, pedestrians, and bicycles. Probably the most significant contribution of 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. A major update of the 1985 edition was published in 1994. Another update is currently being produced by TRB and is expected to be released in early 1998. This article discusses the production and content of 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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