Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 8, Problem 28P
To determine
Compare and contrast the different metering system that used in traffic signal ramp control and conditions for each of them.
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Compare and contrast the different metering systems that are used in traffic-signal ramp control indicating under what conditions you will use each.
QUESTION 1
The approaches of a 4-leg signalized intersection are configured with 1 NB lane, 1 SB lane, 1 EB lane, and 1 WB lane and each of these
lanes serves LT, TH, and RT movements. The following volumes and phasing are provided.
approach EB
WB
NB
SB
movement LT TH RT LT TH RT LT TH RT LT TH RT
volume
120 480 160 80 560 100 20 200 40 12 160 48
2
6
What is the critical sum for the EB/WB barrier?
Task 3: The Intersection design
a. Describe the various principles involved in the design of at-grade intersections and the different types of at-grade intersections. Also, give an example of an appropriate location for the use of each type.
b. Design a suitable signal phasing system and phase lengths for the intersection using the Webster method. Show a detailed layout of the phasing system and the intersection geometry used for the geometric and traffic characteristics shown in table 6 below. And the saturation flow of the intersection is shown in table 7 Discuss the effect of increasing saturation flow rates by 10% higher on the cycle length?
Table 6:The geometric and traffic characteristics of the intersection
Approach (Width)
North (56m)
South (56 m)
East (68m)
West (68m)
Peak hour approach volumes
Left turn
133
73
168
134
Through movement
420
373
563
516
Right turn
140
135
169
178
Conflicting pedestrian volumes
900
1200
1200
900
PHF
0.95
0.95
0.95
0.95…
Chapter 8 Solutions
Traffic and Highway Engineering
Ch. 8 - Prob. 1PCh. 8 - Prob. 2PCh. 8 - Prob. 3PCh. 8 - Prob. 4PCh. 8 - Prob. 5PCh. 8 - Prob. 6PCh. 8 - Prob. 7PCh. 8 - Prob. 8PCh. 8 - Prob. 9PCh. 8 - Prob. 10P
Ch. 8 - Prob. 11PCh. 8 - Prob. 12PCh. 8 - Prob. 13PCh. 8 - Prob. 14PCh. 8 - Prob. 15PCh. 8 - Prob. 16PCh. 8 - Prob. 17PCh. 8 - Prob. 18PCh. 8 - Prob. 19PCh. 8 - Prob. 20PCh. 8 - Prob. 21PCh. 8 - Prob. 22PCh. 8 - Prob. 23PCh. 8 - Prob. 24PCh. 8 - Prob. 25PCh. 8 - Prob. 26PCh. 8 - Prob. 27PCh. 8 - Prob. 28P
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