2. An intersection has a 2-timing stage signal with the movements allowed in each timing stage, analysis and saturation flow rates shown below. Consider that the lost time per timing stage is 3 seconds and a critical v/c ratio of 0.85 is desired. Calculate minimum cycle length, and the effective green times (based on minimum cycle length). Timing Stage 1 2 Allowed movements NB L SB L NB T/R SB T/R EB L WB L EB T/R WB T/R Analysis flow rate (veh/h) 40 30 1125 1075 100 80 250 295 Saturation flow rate(veh/h) 600 600 3400 3200 650 600 1750 1800

2. An intersection has a 2-timing stage signal with the movements allowed in each timing stage, analysis and saturation flow rates shown below. Consider that the lost time per timing stage is 3 seconds and a critical v/c ratio of 0.85 is desired. Calculate minimum cycle length, and the effective green times (based on minimum cycle length). Timing Stage 1 2 Allowed movements NB L SB L NB T/R SB T/R EB L WB L EB T/R WB T/R Analysis flow rate (veh/h) 40 30 1125 1075 100 80 250 295 Saturation flow rate(veh/h) 600 600 3400 3200 650 600 1750 1800

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter8: Intersection Control

Section: Chapter Questions

Problem 17P

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Please answer question 4
Q3- For the traffic signal data below; 1- Fill the table with Data. 2 - calculate optimum cycle length. 3- Draw the timing diagram. Yellow Time All red Time (sec) lost Red Time Geff. Green Phases time (sec) Time (sec) (sec) (sec) (sec) P1 2 1 26 P2 3 1 30 P3 3 2 29 P4 3 1 31
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 3 122 322
Exercise 6 A three phase signal design is given below. ● ● ● Hic Signal What is the sum of the flow ratios for the critical lane groups? What is the total lost time for a signal cycle assuming 2 seconds of clearance lost time and 2 seconds of startup lost time per phase? What is the cycle length using Webster Method? EB - Phase 1 2 3 -200 20 SB 30 100- Lane group SB NB EB WB 400 1000 NB 150 50 300 30 WB Saturation Flows 3400 veh/hr 3400 veh/hr 1400 veh/hr 1400 veh/hr
An intersection has a three-phase signal with the movements allowed in each phase and corresponding analysis and saturation flow rates shown in the table below. Assume the lost time is 4 seconds per phase and a critical intersection v/c of 0.90 is desired. Phase 3 Allowed movements NB L, SB L NB T/R, SB T/R EB L, WB L ЕВ TR, WB TR Analy sis flow rate 330, 365 veh/h 1125, 1075 veh/h 110, 80 veb/h 250, 285 veh/h Saturation flow rate 1700, 1750 veh/h 3400, 3300 veh/h 650, 600 veh/h 1750, 1800 veh/h Calculate the sum of the flow ratios for the critical lane groups. 0.787 O 0.857 O 0.709 O 0,829
Solve it accurate.
A given movement at signalized intersection receives 28-seconds green time, 3.5 seconds of yellow time out of 60 seconds cycle. If saturation flow rate is 3750 vph/lane and the startup lost time is 1.5 seconds, what is the capacity of the movement? 8036 4083 1680 1750
An intersection has a three-phase signal with the movements allowed in each phase and corresponding analysis and saturation flow rates shown in the table below. Assume the lost time is 4 seconds per phase and a critical intersection v/c of 0.90 is desired. Phase 3 Allowed movements NB L, SB L NB T/R, SB T/R EB L, WB L EB TR, WB TR Analysis flow rate 330, 365 veh/h 1125, 1075 veh/h 110, 80 veh/h 250, 285 veh/h Saturation flow rate 1700, 1750 veh/h 3400, 3300 vehh 650, 600 veh/h 1750, 1 800 veh/h Using v/c equalization ratio, calculate the effective green time for phase 3 14.825 sec 15.552 sec O 11.462 sec O 16.065 sec
An 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/h
An intersection has a three-phase signal with the movements allowed in each phase and corresponding analysis and saturation flow rates shown in the table below. Assume the lost time is 4 seconds per phase and a critical intersection v/c of 0.90 is desired. Phase 1 2 3 Allowed movements NB L, SB L NB T/R, SB T/R EB L, WB L EB T/R, WB TR Analysis flow rate 330, 365 veh/h 1125, 1075 veh/h 110, 80 veh/h 250, 285 veh/h Saturation flow rate 1700, 1750 veh/h 3400, 3300 veh/h 650, 600 veh/h 1750, 1800 vehh Calculate minimum cycle length O 255 sec O 60 sec O 155 sec O 100 sec
An intersection has a three-phase signal with the movement allowed in each phase and corresponding analysis and saturation flow rates shown in the table below. Assume the lost time is 4 seconds per phase and a critical intersection v/c of 0.90 is desired Phase 1 2 3 Allowed Movement NB L, SB L NB T/R, SB T/R EB L, WB L EB /T/R, WB T/R Analysis Flow Rate 330, 365 veh/h 1125, 1075 veh/h 110, 80 veh/h 250, 285 veh/h Saturation Flow Rate 1700, 1750 veh/h 3400, 300 veh/h 650, 600 veh/h 1750, 1800 veh/h Calculate the Following: 1.)Sum of flow ratios for critical lane groups 2.)minimum cycle length 3.)using v/c equation ratio, calculate the effective green time for phase 1 4.)using v/c equation ratio, calculate the effective green time for phase 2 5.)using v/c equation ratio, calculate the effective green time for phase 3
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