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Which of the following statements CANNOT be used to describe free flow speed (uf) of a traffic stream?
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- uf is the speed when flow is negligible
- uf is the speed when density is negligible
- uf is affected by geometry and surface conditions of the road
- uf is the speed at which flow is maximum and density is optimum
- uf is the speed when flow is negligible
Correct Option: D
uf is the speed at which flow is negligible and density is also negligible.
