Design Values Perception/Reaction Time = 2 seconds Average Vehicle Length = 25 ft Lane Width = 12 ft Deceleration Rate = 12 ft/sec² Design Speed = 25 mph Start/End Lost Time per phase = 2 sec Saturation Flow Rate = 1900 vphgpl Pedestrian Walk Speed = 3.5 ft/s Minimum Walk Interval = 7 sec Pedestrian perception reaction for walk signal = 3.2 sec 1. The flow rate on a given freeway segment is 1250 vph and the space-mean-speed is 40 mph. Determine: a. the average headway under these conditions b. the average spacing under these conditions c. the equations for the three relationships (q-k, k-u, and q-u) assuming that the flow-density- speed relationship of this freeway segment is described by the Greenshield's model and the free flow speed is 50 mph.
Design Values Perception/Reaction Time = 2 seconds Average Vehicle Length = 25 ft Lane Width = 12 ft Deceleration Rate = 12 ft/sec² Design Speed = 25 mph Start/End Lost Time per phase = 2 sec Saturation Flow Rate = 1900 vphgpl Pedestrian Walk Speed = 3.5 ft/s Minimum Walk Interval = 7 sec Pedestrian perception reaction for walk signal = 3.2 sec 1. The flow rate on a given freeway segment is 1250 vph and the space-mean-speed is 40 mph. Determine: a. the average headway under these conditions b. the average spacing under these conditions c. the equations for the three relationships (q-k, k-u, and q-u) assuming that the flow-density- speed relationship of this freeway segment is described by the Greenshield's model and the free flow speed is 50 mph.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Design Values
Perception/Reaction Time = 2 seconds
Average Vehicle Length = 25 ft
Lane Width = 12 ft Deceleration
Rate = 12 ft/sec² Design Speed =
25 mph
Start/End Lost Time per phase = 2 sec
Saturation Flow Rate = 1900 vphgpl
Pedestrian Walk Speed = 3.5 ft/s Minimum
Walk Interval = 7 sec
Pedestrian perception reaction for walk signal = 3.2 sec
1. The flow rate on a given freeway segment is 1250 vph and the space-mean-speed is 40 mph.
Determine:
a. the average headway under these conditions
b. the average spacing under these conditions
c. the equations for the three relationships (q-k, k-u, and q-u) assuming that the flow-density-
speed relationship of this freeway segment is described by the Greenshield's model and the free
flow speed is 50 mph.
2. A section of highway has the flow-density relationship as q = 50k - 0.156k². What is the
capacity of the highway section, the speed at capacity, and the density when the highway is at
one-quarter of its capacity?
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