SUSTAINABLE ENERGY (LL)
2nd Edition
ISBN: 9780357667224
Author: DUNLAP
Publisher: CENGAGE L
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***Please answer all parts. They are part of a single question and not different questions altogether. I will like the solution as well. Thank you!
Consider the geometric and traffic characteristics shown below.
Approach
(Width)
Peak hour Approach Volumes:
Left Turn
Through Movement
Right Turn
Conflicting Pedestrian Volumes
PHF
For the following saturation flows:
North
(56 ft)
South
(56 ft)
East
(68 ft)
West
(68 ft)
165
105
200
166
442
395
585
538
162
157
191
200
900
1,200
1,200
900
0.95
0.95
0.95
0.95
Through lanes:
1,600 veh/h/in
Through-right lanes:
1,400 veh/h/in
Left lanes:
1,000 veh/h/in
Left-through lanes:
1,200 veh/h/in
Left-through-right lanes:
1,100 veh/h/in
The total cycle length was 277 s. Now assume the saturation flow rates are 10% higher, that is, assume the following saturation flow rates:
Through lanes:
Through-right lanes:
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
Determine a suitable signal phasing system and phase lengths (in s) for the intersection using the Webster method. (Enter the sum of green and yellow times for…
Determine the minimum of the appropriate yellow interval (Y
.
approach speed limit: 45 mi/h
approach grade: 3.2% downgrade
assumed perception-reaction time: 1.0 sec
assumed deceleration rate: 11.2 ft/sec²
assumed average vehicle length: 20 ft
width of intersection to be crossed: 56 ft
min'
in s) for a signal phase under the following conditions.
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