According to the Greenshields traffic flow model, maximum flow occurs when density is:
Correct answer: C. One-half of the jam density
- A. One-fourth of the jam density
- B. Equal to the jam density
- C. One-half of the jam density
- D. Twice the jam density
Explanation
The Greenshields model assumes a linear relationship between speed and density. Under this assumption, maximum flow occurs at a density equal to half the jam density.
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Transportation engineering covers highway planning and alignment, traffic studies, road geometric design, pavement materials and flexible or rigid pavement construction. It also includes railway, airport and traffic engineering concepts such as sight distance, superelevation, signals, capacity and level of service, distinguishing pavement failure from poor geometric design.
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