Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 4, Problem 17P
To determine
(a)
The volume in southward and northward direction at the given section of the highway using moving-vehicle technique.
To determine
(b)
The travel time in southward and northward direction at the given section of the highway using moving-vehicle technique.
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Question 2
Because the new travel time rate (TTR) from the
additional traffic (e.g., 300vph) exceeds the minimum
acceptable local standard of 2.0 min/mile, it is
proposed to increase the road capacity by
900vph/lane by adding one lane in each direction.
Calculate the new travel time rate and traffic volume
using:
a. The traditional method of traffic impact analysis, and
b. The above-mentioned pivot point analysis method.
c. Compare the results of the two methods and comment on their
significance.
4-14
Table 4.10 shows data obtained in a travel time study on a section of highway using the
moving-vehicle technique. Estimate (a) the travel time and (b) the volume in each
direction at this section of the highway.
Chapter 4
Traffic Engineering Studies
149
Table 4.10
Travel Time Data for Problem 4-14
No. of
No. of
No. of
Vehicles
Vehicles
That
Vehicles
Run
Travel
Traveling in
Орposite
Overtook
Overtaken
by Test
Vehicle
Direction/
Time
Test
Number
(min)
Direction
Vehicle
Northward
5.25
100
2
2
2
5.08
105
2
1
3
5.30
103
3
1
4
5.15
110
1
5.00
101
6.
5.51
98
7
5.38
97
1
1
8
5.41
112
2
3
5.12
109
3
1
10
5.31
107
Southward
1
4.95
85
1
2
4.85
88
1
3
5.00
95
1
4
4.91
100
2
1
4.63
102
1
5.11
90
1
1
7
4.83
95
8
4.91
96
3
1
9
4.95
98
1
2
10
4.83
90
1
Q1 (a)
i.
10,000 vehicle speed traffic data were collected during the weekday on
route FT050 at Batu Pahat, Johor. Suggest how to quantify and describe
the basic characteristic of this data. Then explain how the method you
suggested can help others to understand the data.
(4 marks)
ii.
Consider the following data from 11 truck speed data climbing a hilly
road. Compute 5 (FIVE) basic statistics of the sample speed as
following:
Sample mean
Median
а.
b.
с.
Variance
d.
Range
Standard error of the mean
е.
Speed (km/h)
25
Truck
1
2
35
3
55
4
15
40
6.
25
7
55
8.
35
9.
45
10
11
20
Chapter 4 Solutions
Traffic and Highway Engineering
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