x1 In a 176 ft. speed trap the following frequency of time were recorded: TIME SEC NO. OF VEHICLES OBSERVED 1.0 1.4 2 1.4 1.8 1 1.8 2.2 5 2.2 2.6 36 2.6 3.0 54 3.0 3.4 52 3.4 3.8 25 3.8 4.2 12 4.2 4.6 3 VA 4.6 5.0 5.0 NO 2 0 (a) Covert the time to speeds. (b) 30 00 Calculate the mean, median, standard distribution, variance, and modal speed of the sample. (c) Plot the cumulative frequency and measure the 15th, 50th and 85th percentile speeds. What would you recommend as a speed limit on this facility? Explain your reasoning in making your choice. (d) = Σnisi N S = N-I

Traffic and Highway Engineering
5th Edition
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Garber, Nicholas J.
Chapter9: Capacity And Level Of Service For Highway Segments
Section: Chapter Questions
Problem 17P
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Please complete parts A, B, C, and D.

x1
In a 176 ft. speed trap the following frequency of time were recorded:
TIME SEC
NO. OF VEHICLES OBSERVED
1.0
1.4
2
1.4
1.8
1
1.8
2.2
5
2.2
2.6
36
2.6
3.0
54
3.0
3.4
52
3.4
3.8
25
3.8
4.2
12
4.2
4.6
3
VA
4.6 5.0
5.0
NO
2
0
(a) Covert the time to speeds.
(b)
30 00
Calculate the mean, median, standard distribution, variance, and modal speed of the
sample.
(c) Plot the cumulative frequency and measure the 15th, 50th and 85th percentile speeds.
What would you recommend as a speed limit on this facility? Explain your reasoning
in making your choice.
(d)
=
Σnisi
N
S =
N-I
Transcribed Image Text:x1 In a 176 ft. speed trap the following frequency of time were recorded: TIME SEC NO. OF VEHICLES OBSERVED 1.0 1.4 2 1.4 1.8 1 1.8 2.2 5 2.2 2.6 36 2.6 3.0 54 3.0 3.4 52 3.4 3.8 25 3.8 4.2 12 4.2 4.6 3 VA 4.6 5.0 5.0 NO 2 0 (a) Covert the time to speeds. (b) 30 00 Calculate the mean, median, standard distribution, variance, and modal speed of the sample. (c) Plot the cumulative frequency and measure the 15th, 50th and 85th percentile speeds. What would you recommend as a speed limit on this facility? Explain your reasoning in making your choice. (d) = Σnisi N S = N-I
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