(1) What is the flow when avg. speed is 50 mph? (2) A traffic study provided the # of acceptance and rejection by different gap values, shown in the Table below. What is the critical gap? Explain your answer. Hint: you can find that gap value by inspection. No calculation is needed.
(1) What is the flow when avg. speed is 50 mph? (2) A traffic study provided the # of acceptance and rejection by different gap values, shown in the Table below. What is the critical gap? Explain your answer. Hint: you can find that gap value by inspection. No calculation is needed.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Version A. A highway section is determined to have a jam density of 230 veh/mi. A free-flow
speed of 65 mph. Answer the following questions:
(1) What is the flow when avg. speed is 50 mph?
(2) A traffic study provided the # of acceptance and rejection by different gap values,
shown in the Table below. What is the critical gap? Explain your answer. Hint: you can
find that gap value by inspection. No calculation is needed.
Gap
(second)
0.5
1
1.2
1.4
1.6
1.8
2
24
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3.8
4
4.2
4.4
4.6
4.8
5
#
Acceptance
0
2
5
5
6
14
20
25
26
30
40
42
48
50
54
53
60
67
68
70
75
80
#
Rejection
80
78
75
75
74
66
60
55
54
50
40
38
32
30
26
27
20
13
12
10
5
0
(3) This highway section crosses a minor road. Drivers from the minor road must seek
appropriate gaps to merge onto the highway. Traffic laws require that minor-road traffic
merge onto the outside lane of the highway. Traffic flow on that outside lane is found to
be 1,200 veh/h. How many cars can turn at most from the minor road per hour? Use the
critical gap you obtained from (2). Assume only one car can turn per gap.
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