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Unformatted text preview: 9. Assuming a linear speed‐density relationship, the mean free speed is observed to be 55 mph near zero density, and the corresponding jam density is 130 veh/mi. Assume that the average length of vehicles is 19 ft. (a) Write down the speed‐density and flow‐density equations (b) Draw the u ‐ k, u ‐ q, and q ‐ k diagrams indicating critical values (c) Compute speed and density corresponding to a flow of 90 veh/hr (d) Compute the average headways, spacings, clearances, and gaps when the flow is maximum. 10. On a specific westbound section of highway, studies show that the speed‐density relationship is The highway’s capacity is 3800 veh/hr and the jam density is 140 veh/mi. (a) What is the space‐mean speed of the traffic at capacity? (b) What is the free‐flow speed?...
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- Fall '11
- Miles per hour, Mile, jam density