The speed-density relationship in a mid-block section of a highway follows the Greenshield's model. If the free flow speed is $v_{f}$ and the jam density is $k_{j},$ the maximum flow observed on this section is

(A) $v_{f} k_{j}$

(B) $\frac{v_{f} k_{j}}{2}$

(C) $\frac{v_{f} k_{j}}{4}$

(D) $\frac{v_{f} k_{j}}{8}$

The speed-density relationship in a mid-block section of a highway follows the Greenshield's model. If the free flow speed is $v_{f}$ and the jam density is $k_{j},$ the maximum flow observed on this section is

(A) $v_{f} k_{j}$

(B) $\frac{v_{f} k_{j}}{2}$

(C) $\frac{v_{f} k_{j}}{4}$

(D) $\frac{v_{f} k_{j}}{8}$

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