0 votes 0 votes 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 $0$ $\frac{v_{f}}{4}$ $\frac{v_{f}}{2}$ $v_{f}$ Traffic Engineering gatecivil-2021-set2 traffic-studios-on-flow-and-speed + – go_editor asked Mar 1, 2021 • recategorized Apr 25, 2021 by Chandanachandu go_editor 5.3k points answer See all 0 reply