in Traffic Engineering recategorized by
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Which of the following statements CANNOT be used to describe free flow speed $(u_f)$ of a traffic stream?

  1. $(u_f)$ is the speed when flow is negligible
  2. $(u_f)$ is the speed when density is negligible
  3. $(u_f)$ is affected by geometry and surface conditions of the road
  4. $(u_f)$ is the speed at which flow is maximum and density is optimum
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