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? SB A 400 EB WB 1000 100 "Y NB 200 20 30 150 50 300 30
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- Example 3 Because of a minor collision, one of the two SB lanes on a freeway is blocked at 8:13am. The normal freeway capacity of 3600 vph is reduced to 1340 vph. The SB flow rate at this time of day is 2715 vph. The blockage is removed after 15 minutes. - Find the maximum queue length Maximum time spent in queue - - - Time of queue dissipation - Total delay -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 1750An 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
- An isolated three-phase signal is being designed for optimum cycle length of 90 s. The total lost time from all the three phases is 15-s. The critical flow ratios for phase I and II are 0.2 and 0.3 respectively. Determine the critical flow ratio for phase III as per Webster's method of traffic signal design. Given that saturation flow for volume in phase III is 500 pcu. SI C 20161An intersection has a four-phase signal with the movements allowed in each phase and corresponding and saturation flow rates shown in the table below. Phase 1 2 3 4 Allowed movements EB L, WB L EB T/R, WB T/R SB L, SB T/R NB L, NB T/R Analysis flow rate 245, 230 veh/h 975, 1030 veh/h 255, 235 veh/h 225, 215 veh/h Saturation flow rate 1750, 1725 veh/h 3350, 3400 veh/h 1725, 1750 veh/h 1700, 1750 vehh Calculate the sum of the flow ratios for the critical lane groups. O 0.714 O 0.723 0.751 0.702QUESTION 1 The approaches of a 4-leg signalized intersection are configured with 1 NB lane, 1 SB lane, 1 EB lane, and 1 WB lane and each of these lanes serves LT, TH, and RT movements. The following volumes and phasing are provided. approach EB WB NB SB movement LT TH RT LT TH RT LT TH RT LT TH RT volume 120 480 160 80 560 100 20 200 40 12 160 48 2 6 What is the critical sum for the EB/WB barrier?
- Subject: transportation engineering Read the question carefully and give me right solution according to the question. A signal has four phases, where the critical lane group flow ratios are 0.115, 0.204, 0.099, and 0.248. If the lost time per phase is 6 seconds and the critical intersection v/c ratio is 0.88, calculate the minimum cycle length and the phase effective green times such that the lane group v/c ratios are equal.16 ut of age Which of the following occurs in Interrupted Flow Facilities? Select one: A. External interruptions exists B. Frequent signals and stop/yield signs C. Platoons of vehicles in traffic stream D. All of the above OE. B and C Next pageFor the geometric characteristics, traffic conditions (traffic volumes are in vehicles per hour) and signal timing shown below, complete parts A through E for the Northbound and Eastbound approaches. A. Adjust the volumes. B. Find the saturation flow rate. C. Find the degree of saturation. D. Find the theoretical delay for each movement. E. Find the theoretical delay and LOS for the EB and NB approaches. Bus stop 5 stops/hr $12 ft teach 6% HV 400 6% HV 650 100 12 ft each - Isolated signal with random arrivals, AT-3 - No residual demand delay 11 ft each - No bicycles or pedestrians Bus stop 5 stops/hr P C = 60 sec Lost time = 3.5 sec/ 7550 2% HV - G=42 Y=4 G=10; Y=4 G=8 Y=4 G=30 Y=4 Φ1 Φ2 ФЗ Assume the intersection is located at Central Business District (CBD) Assume that both the streets are located on level grades, i.e. G = 0 Assume a PHF = 0.95 Assume random arrival i.e. AT-3 Assume that the intersection is isolated and signal is pre-timed
- 1.. Please show work and steps. If an approach has a PHF of 0.90 and a counted hourly volume of 800 veh/hr what is the maximum 15-minute volume and peak rate of flow? What is the highest and lowest possible value of PHF? At a given location, the space mean speed is measured as 70 mph and the rate of flow as 2200 pc/h/ln. What is the density at this location for the analysis period? How could you decrease the density by 10%?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 1 3 4 Allowed movements EB L, WB L EB T/R, WB T/R SB L, SB T/R NB L, NB T/R Analysis flow rate 245, 230 veh/h 975, 1030 veh/h 255, 235 veh/h 225, 215 veh/h Saturation flow rate 1750, 1725 vehh 3350, 3400 veh/h 1725, 1750 veh/h 1700, 1750 veh/h Calculate the optimum cycle length (Assume 4 seconds lost time per phase) O 116.466 sec O 104.693 sec 97.315 sec O 101.399 secAn 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