Highway Capacity Manual Revisited

by Roger P. Roess, Prof.; Polytechnic Inst., N.Y.,

Serial Information: Civil Engineering—ASCE, 1984, Vol. 54, Issue 11, Pg. 69-71

Document Type: Feature article


The forthcoming third edition of this manual of highway and traffic engineering, due in 1985, will significantly change how highway capacity is analyzed. Of the edition's many changes, the most significant, perhaps, will be a new procedure for analyzing signalized intersections—for the first time it permits analyzing each approach lane to and departure lane from an intersection. As for two-lane rural highways, a new procedure here emphasizes the impact on capacity of directional interactions, terrain, and ability to pass. For uninterrupted flow on freeways, the key criterion is no longer vehicular volume but vehicular density. Chapters on public transit, pedestrians and bicycles use as the criterion person-capacity as well as vehicle capacity. To help obtain uniformly excellent results in applying the techniques in the book, microcomputer programs will be written.

Subject Headings: Highway engineering | Highways and roads | Traffic capacity | Traffic signs | Traffic analysis | Intersections | Driver behavior | Public transportation

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