16. If a roadway has a flow rate of 1,600 vehicles per hour per lane and a speed

Question

16. If a roadway has a flow rate of 1,600 vehicles per hour per lane and a speed of 55 mph, what is the traffic density? 17. If a roadway has a free-flow speed of 70 mph, a jam density of 140 veh per lane, and a density of 80 veh per lane, what is the speed of traffic? 18. What is the free-flow speed for an interstate with 11 ft lanes, a 4 ft right shoulder, and 2 ramps per mile? 19. What is the Level of Service for an urban highway with an hourly volume of 3000 vehicles, a 15-minute volume of 900 vehicles, 2 lanes, 5% trucks, and drivers that are familiar with the roadway?

Explanation / Answer

prob. 6

Use the relation between traffic flow, velocity and density, Q = v.k

so, k = Q/v = 1600/55 = 29.09 vehicles/miles.

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