In traffic flow theory, the speed at which the product of speed and density becomes maximum is called the:
Correct answer: C. Critical speed
- A. Design speed
- B. Free-flow speed
- C. Critical speed
- D. Spot speed
Explanation
Flow equals speed multiplied by density, and its maximum value occurs at the critical speed. Free-flow speed describes operation with little interaction, while spot speed is measured at a particular location and time.
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About Transportation Engineering
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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