A section of highway has a speed-flow relationship of the form q = au2 + bu It is known that at capacity (which is 3100 veh/h) the space-mean speed of traffic is 28 mi/h. Determine the speed when the...

Extracted text: A section of highway has a speed-flow relationship of the form q = au2 + bu It is known that at capacity (which is 3100 veh/h) the space-mean speed of traffic is 28 mi/h. Determine the speed when the flow is 1500 veh/h and the free-flow speed.