Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 8, Problem 22P
To determine
What is cycle used for the design a simultaneous traffic signal system for six intersections on a suburban arterial. Give reason.
Expert Solution & Answer
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Analyze the unsignalized intersection below and calculate the optimum cycle length if the
intersection will be signalized.
Approach
E
W
N
S
Maximum no.
of lanes
5
5
4
4
Direction
Through
left
Through
left
Through
left
Through
left
N
Total volume
pcu/hr
1,480
370
860
586
1,360
494
2,030
265
Sat. flow rate
pcu/hr/lane
2,400
1,700
2,400
1,700
2,200
1,800
2,200
1,800
In order to determine the DHV from a traffic count worksheet, the first step is to:
Group of answer choices
Calculate the PHF of each approach
Determine which hour has the highest total intersection volume in veh/hr
Convert all of the turning counts from veh/15-min to veh/hr
Calculate the PHF of the intersection
Consider the geometric and traffic characteristics shown below.
Approach
(Width)
Peak hour Approach Volumes:
Left Turn
Through Movement
Right Turn
Conflicting Pedestrian Volumes
PHF
North South
(56 ft) (56 ft)
160
100
H
452
405
167
162
900
0.95
1,600 veh/h/In
1,400 veh/h/In
1,000 veh/h/In
1,200 veh/h/In
Left-through-right lanes: 1,100 veh/h/In
Left lanes:
Left-through lanes:
Left-through-right lanes:
1,760 veh/h/In
1,540 veh/h/In
1,100 veh/h/In
1,320 veh/h/In
1,210 veh/h/In
Phase 1: N-S left turn
Phase 2: N-S through & through-right turn
Phase 3: E-W left turn
For the following saturation flows:
Through lanes:
Through-right lanes:
Left lanes:
Left-through lanes:
B
The total cycle length was 281 s. Now assume the saturation flow rates are 10% higher, that is, assume the following saturation flow rates:
Through lanes:
Through-right lanes:
Phase 4: E-W through & through-right turn
Total cycle length
1,200
0.95
East
(68 ft)
S
S
S
S
195
595
196
1,200
0.95
West
(68 ft)
Determine a suitable…
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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