Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
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
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
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
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
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
Knowledge Booster
Similar questions
- 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.arrow_forwardDesign a two phase signal for the VCI = 400 PCU/hr V250 PCU/hr SE = 1250 PCU/hr data using All red for pedestrain crossing mindbook 11 -SE = 1000 PCU/hr Webster method =125eearrow_forwardA signalized intersection approach has three lanes with no exclusive left or right turning lanes. The approach has a 40- second green out of a 75-second cycle. The yellow plus all-red intervals for phase total 4.0 seconds. If the start-up lost time is 2.3s/phase, the clearance lost time is 1.1s/phase, and thesaturation headway is 2.48 s/veh under prevailing conditions, a. Calculate the saturation flow rate (veh/hr and whole number) b. Calculate the effective green time (sec and in 1 decimal) c. what is the capacity of the intersection approach? (veh/h/In and 2 decimals)arrow_forward
- For 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_forwardQ2- 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_forwardA two-phase signalized intersection is designed with a cycle time of 100 s. The amber and red times for each phase are 4 s and 50 s, respectively. If the total lost time per phase due to start-up and clearance is 2 s, the effective green time of each phase is _s. (in integer)arrow_forward
- 19-5. 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_forward10. For the intersection shown below draw a 3-phase traffic signal operation.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. N-S Approaches E-W Approaches Median width, (ft) 16 12 Number of 12 ft lanes on each approach 3 2 Design speed, mph 50 40 Grade 0% 3% Determine the minimum green times (in s) for each approach if the effective crosswalk width in each direction is 8 ft and the number of pedestrians crossing during an interval is 22 in the N-S direction and 31 in the E-W direction. (Assume the average speed of pedestrians is 3.5 ft/s, and that it is feasible to disregard the yellow change and red clearance intervals.)arrow_forward
- How long should the “yellow” signal be for vehicles approaching a traffic signal on a 2% descent at 35 miles per hour? Use a standard reaction time of 1.0 second and standard AASHTO deceleration rate.arrow_forwardAn intersection has a four-phase signal with the movements allowed in each phase and corresponding analysis and saturation flow rates shown in the table below. Phase Allowed movements Analysis flow rate Saturation flow rate O 116.466 sec O 97.315 sec O 104.693 sec 1 EB L, WB L 245, 230 veh/h 1750, 1725 veh/h Calculate the optimum cycle length (Assume 4 seconds lost time per phase) O 101.399 sec 2 EB T/R, WB T/R 975, 1030 veh/h 3350, 3400 veh/h 3 SB L, SB T/R 255, 235 veh/h 1725, 1750 veh/h 4 NB L, NB T/R 225, 215 veh/h 1700, 1750 veh/harrow_forwardA traffic signal control is being designed for a four-leg intersection on a divided highway with the characteristics shown in the table below. N-S Approaches E-W Approaches Median width, (ft) 16 12 Number of 12 ft lanes on each approach 3 2 Design speed, mph 50 40 Grade 0% 3% Determine the minimum green times (in s) for each approach if the effective crosswalk width in each direction is 8 ft and the number of pedestrians crossing during an interval is 31 in the N-S direction and 34 in the E-W direction. (Assume the average speed of pedestrians is 3.5 ft/s, and that it is feasible to disregard the yellow change and red clearance intervals.) Gmin, N-S = s Gmin, E-W = sarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Traffic and Highway EngineeringCivil EngineeringISBN:9781305156241Author:Garber, Nicholas J.Publisher:Cengage Learning
Traffic and Highway Engineering
Civil Engineering
ISBN:9781305156241
Author:Garber, Nicholas J.
Publisher:Cengage Learning