GATE Civil Engineering
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Relationship between traffic speed and density is described using a negatively sloped straight line. If $v_{f}$ is the free flow speed then the speed at which the maximum flow occurs is

  1. $0$
  1. $\frac{v_{f}}{4}$
  1. $\frac{v_{f}}{2}$
  1. $v_{f}$
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