Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 8, Problem 23P
To determine
Given problem
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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
Q3.
A new section of a freeway is to be designed with a free-flow-speed of 65 mph along of
0.75 mile on 5% upgrade. The expected traffic volume is 4200 v/hr. The traffic composition
is 15% trucks, 5% recreational vehicles, and 10% buses. The peak hourly factor is 0.9, the
unfamiliar driver factor is 0.95. If the design requirement is to target a level of service (B).
how many lanes must be provided to satisfy the design requirement?
Four-phases signal with a cycle time of 80 sec, Inter Green = 4 sec/phase, lost
time / phase = 2 sec. Saturation flow on all approaches are similar, but the
maximum traffic flows on two of the phases are triple the maximum traffic
flows on the remaining two approaches, what will be actual green time on each
phase ?
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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