Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 8, Problem 12P
To determine
Phase numbers at eight phase signals in which left turn phasingthe conventional numbering of phases and the relationship which is given on all
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Students have asked these similar questions
If the all-red time required for pedestrian
crossing at a two-phase signal is 12 s and the
average normal flow for the two roads, A and
B was given as 525 and 375, respectively and
the saturation flow was given as 1650 and
1200 respectively. Find the green time in
seconds required for road A.
For designing a 2-phase fixed type signal at an intersection having North-South
and East-West road where only straight ahead traffic permitted, the following data
are available.
Parameter Design North
Hour
Flow (PCU/hr)
1000
2500
South
700
2500
East
900
3000
West
550
3000
Saturation Flow
(PCU/hr)
Total time lost per cycle is 12 seconds. The cycle length (seconds) as per Webster's
approach is
Q4: a. At a certain at grade intersection, it's decided to use a 4 phases traffic
signal for the four approaches shown below.
South
Approach
Width (m)
Actual flow (DHV) pe/hr
North
East
West
7
8
12
10.5
331
427
1104
715
Left turn vehicles of
478
630
1953
1047
saturation flow
Assuming the following for each phase:
Starting delay and falling discharge time = 3 sec, amber time = 5 sec, all red = 1
sec, red/amber I sec.
Find the optimum cycle time and the controller green for 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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- Q2- The table below lists the needed data for designing a traffic signal for a 3-leg signalized intersection. Determine the following using Webster's method; assume Qs is 2000 vphpl. 1- Compute the actual green and actual red intervals. 2- Draw the cycle timing diagram. Qa (vph) Amber All-red ts (sec) Lane 1 Lane 2 (sec) (sec) Phase I 399 710 4 Phase II 520 366 3 Phase III 144 210 3 122 322arrow_forwardFor the geometric and traffic characteristics 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. North South East West Арproach 56 ft Approach 56 ft Арproach 68 ft Аpproach 68 ft Approach Width Peak-hour approach volume Left turn Through movement Right turn PHF Confilicting pedestrian volume 900 ped/hr 73 373 133 168 134 420 563 516 140 135 169 178 0.95 0.95 0.95 0.95 1200 ped/hr 1200 ped/hr 900 ped/hr Assume the following saturation flows: Through lanes 1600 veh/In/h Through and right lanes 1400 veh/In/h Left lanes 1000 veh/In/h Left and through lanes 1200 veh/In/h Left, through, and right lanes 1100 veh/In/harrow_forward19-5. Develop a signal timing for the intersection shown below. 30 ft N PHF = 0.92 Level terrain Target v/c ratio = 0.95 Moderate pedestrian activity Average approach speeds: 30 mi/h N-S 40 mi/h E-W 85 ft Crosswalk widths = 10 ft Crosswalk setback = 2.0 ft Vehicle deceleration (a) = 10.0 ft/s? Driver reaction time (t) = 1.0 s Pedestrian walking speed 3.5 s Length of typical vehicle = 18 ft l = e = 2.0 s Demand Volumes for Problem 16-4 O (veh/h) Аpproach Left Through Right ЕВ 200 800 120 WB 160 1,050 100 NB 10 420 10 SB 12 400 8arrow_forward
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