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Highway Capacity Analyses

Capacity capacity is a somewhat generic term when mathematical computations are done by the traffic engineer to determine the ability of a roadway or an intersection or an interchange or a roundabout to carry existing or anticipated traffic volumes. Performing capacity analyses is the technical part of a traffic study.

The Highway Capacity Manual (HCM) is the guidebook for performing capacity analyses for various road elements. For more than 50 years, the HCM has been viewed as the authoritative reference document for use in conducting engineering capacity  analyses aimed at determining the operational adequacy of a transportation facility. Whereas the first (1950) edition of this manual contained less than two hundred pages and was used mostly  for sizing and designing highway facilities, the fourth (2000) edition of the manual contains more than one thousand pages. 

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