Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 4, Problem 4P
To determine
Whether the engineer has met with all of the requirements of the study
Expert Solution & Answer
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An engineer wishing to obtain the speed characteristics on a bypass around her city at
a confidence level of 95%, and an acceptable limit of 1.0 mi/h collected a total of
130 spot speed samples and determined that the variance is 25 (mi/h)2
. Has the engineer met with all of the requirements of the study?
An engineer wishing to obtain the speed characteristics on a bypass around her city at
a confidence level of 95%, and an acceptable limit of + 1.0 mi/h collected a total of
130 spot speed samples and determined that the variance is 25 (mi/h). Has the engi-
neer met with all of the requirements of the study?
Question 4
One stretch of two-lane two-way roadway that traverses through level terrain is expected
to carry 1400 vehicle per hour. Determine the Level of Service (LOS) in the peak
direction for the road based on average travel speed (ATS) if the characteristics of the
roadway are as follows:
Table Q4-1
Percentage of Trucks
Percentage of Recreational Vehicle
Peak Hour Factor
10
0.97
60:40
60
Percent Directional Split
Percent no-passing Zone
Lane Widths
Shoulder Widths
Design Speed
Road Length
Access Points
3.35 m
1.2 m
96 km/h
8 km
10 access points per km
State all assumption (if any) used in calculation..
Chapter 4 Solutions
Traffic and Highway Engineering
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