The speed-density relationship in a mid-block section of a highway follows the Greenshields’s model. If the free flow speed is vf and the jam density is kj , the maximum flow observed on this section is
1
\(\frac{{{v_f}{k_j}}}{2}\)
2
\(\frac{{{v_f}{k_j}}}{8}\)
3
vfkj
4
\(\frac{{{v_f}{k_j}}}{4}\)