99 Under Nath
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
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.

Transcribed Image Text:Speed (miles/hr)
Flow (veh/hr/lanel
Speed (miles/hr)
60
50
40
30
20
10-
0
2400
2000
1600
1200
800
400
0
60
50
40
30
20
10
0
10
10
1
20 30
20
Greenshields
Greenberg
Underwood
- Northwestern
50 60 70 80
100 110 120 130
Density (veh/mile/lane)
50 60 70
80
100
110 120 130
Density (veh/mile/lane)
800 1000 1200 1400 1600 1800 2000 2200 2400 2600
Flow (veh/hr/lane)
Figure Question 1b
200 400 600
40
30 40
90
90
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