Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 8, Problem 16P
To determine
Using Webster methods for intersection determine suitable signal phasing system and phase length.
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The geometric and traffic characteristics are shown below, determine 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.
South
Approach
S6 fi
North
East
West
Approach
56 fi
Approach
Approach
68 f
Арproach Widih
Peak-hour approach volume
Left turn
Through movement
Right turn
PHF
Confilicting pedestrian volume 900 ped/hr 1200 ped/hr 1200 ped/hr 900 ped/hr
133
420
73
168
134
373
135
563
516
178
140
169
0.95
0.95
0.95
0.95
Assume the following saturation flows:
Through lanes: 1760 vehIn/h
Through and right lanes: 1540 veh/In/h
Left lanes: 1100 veh/n/h
Left and through lanes: 1320 veh/in/h
Left, through, and right lanes: 1210 veh/n/h
Consider the tabulated intersection design data
below, then the number of vehicles stopped during
the red interval for Phase EW is about
..............
vehicles. Assume that Qs is 2000 vphpl and use
Webster's method procedure.
All-red ts (sec)
(sec)
Qa (vph)
Yellow
Lane 1
Lane 2
(sec)
Phase N
500
600
2
3
Phase S
650
550
2
2
2
Phase EW
300
250
2
1
2
а.
13
b.
C.
10
d.
6.
Clear my choice
For the traffic characteristics and signal phasing system shown below, determine suitable phase lengths for the intersection using the Webster method. For each approach, assume one dedicated left-turn lane, one through lane, and one through-right lane.
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
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- 5. Design signal timing for an intersection with the following details. Assume a total loss time of 3 seconds per phase. Width of lanes are 12 ft each. Assume that there are 20 pedestrians crossing each of the approaches per cycle. Check the signals for pedestrian crossing time. Take pedestrian walking speed as 4 ft/s. Saturation flow rates are: Left-turning: 1600 veh/hr/ln, Through: 1800 veh/hr/In, and Right- turning: 1700 veh/hr/In A 488 488 115 1051 217 N 338 -338 (В Phase I Phase II Phase III J!!! J↓↓ Yrarrow_forward6. Design signal timing for an intersection with the following details. Assume a total loss time of 3 seconds per phase. Width of lanes are 12 ft each. Assume that there are 20 pedestrians crossing each of the approaches per cycle. Check the signals for pedestrian crossing time. Take pedestrian walking speed as 4 ft/s. Saturation flow rates are: Left-turning: 1600 veh/hr/ln, Through: 1800 veh/hr/In, and Right-turning: 1700 veh/hr/In 488 488 234- 115 C 1051 217 N 338 -338 Phase I Phase II Phase III 11 AN J|| Narrow_forwardSubject : Transportation Engineering Give me right answerarrow_forward
- For the traffic characteristics and signal phasing system shown below, determine suitable phase lengths for the intersection using the Webster method. For each approach, assume one dedicated left-turn lane, one through lane, and one through-right lane.arrow_forwardA signalized intersection has two lane groups. The two WBT lanes (lane group #1) have a total volume of 863 pc/h and an average control delay of 24.5 seconds. The one WBL lane (lane group #2) has a volume of 203 pc/h and an average control delay of 36.5 seconds. What is the approach's LOS? Group of answer choices LOS A LOS D LOS C LOS Barrow_forwardConsider the geometric and traffic characteristics shown below. Approach (Width) Peak hour Approach Volumes: North (56 ft) South East West (56 ft) (68 ft) (68 ft) Left Turn Through Movement Right Turn Conflicting Pedestrian Volumes PHF For the following saturation flows: 165 105 200 166 442 395 585 538 172 167 201 210 900 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 289 s. Now assume the saturation flow rates are 10% higher, that is, assume the following saturation flow rates: Through lanes: 1,760 veh/h/In Through-right lanes: Left lanes: Left-through lanes: Left-through-right lanes: 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…arrow_forward
- 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…arrow_forwardA traffic signal control is being designed for a four-leg intersection on a divided highway with the characteristics shown in the table below. Assuming the average vehicle length L is 6m, Determine an appropriate length of the yellow interval for each approach and how you will provide it. Use the AASHTO recommended deceleration rate and perception-reaction time. N-S Approaches E-W Approaches Median width, (m) 6. 3 No. of 3.5 lanes 3 on each approach Design speed, km/h 60 Grade -3.5 2. 80arrow_forwardTwo adjacent signalized intersections along a major arterial are 650 ft apart (stop line to stop line distance). If the space mean speed between these two intersections is 22 mph, what should be the signal offset of the downstream intersection relative to the upstream intersection? Group of answer choices 20.0 sec 13.5 sec 40.0 sec 29.5 secarrow_forward
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