The optimum speed and the optimum density for the high-speed freeway data set is assumed to be 40 miles per hour and 50 vehicles per mile per lane, respectively. Determine the equations for the Greenberg, Underwood, and Northwestern models, and construct flow-speed-density relationships in a fashion similar to Figure Question 1b. 6050GreenshieldsGreenberg40Underwood30Nanhwastarn2010-50 60 70 001020304006100110120130Density (veh/mile/lane)240020001600120080040010 20 30405060708090100110120130Density (veh/mile/lane)605040302010200400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600Flow (vehhr/lane)Figure Question 1bFlow (veh/hr/lanelSpeed (miles/hr)(4/1ju) paads

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Answered: The optimum speed and the optimum…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The optimum speed and the optimum density for the high-speed freeway data set is assumed to be 40 miles per hour and 50 vehicles per mile per lane, respectively. Determine the equations for the Greenberg, Underwood, and Northwestern models, and construct flow-speed-density relationships in a fashion similar to Figure Question 1b.

60
50
Greenshields
Greenberg
40
Underwood
30
Nanhwastarn
20
10-
50 60 70 00
10
20
30
40
06
100
110
120
130
Density (veh/mile/lane)
2400
2000
1600
1200
800
400
10 20 30
40
50
60
70
80
90
100
110
120
130
Density (veh/mile/lane)
60
50
40
30
20
10
200
400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600
Flow (vehhr/lane)
Figure Question 1b
Flow (veh/hr/lanel
Speed (miles/hr)
(4/1ju) paads

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