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. WB NB SB approach EB movement LT TH RT LT TH RT LT TH RT LT THRT volume 120 480 160 80 560 100 20 200 40 12 160 48 4 2 What is the critical sum for the EB/WB barrier?
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- The through movement passenger car equivalents (pcphpl) for each approach of Vine and Maple Streetsintersections obtained from a traffic survey as shown in the following diagram. Vine Street for NSmovements 1s 48 ft wide and Maple Street for EW movements is 60 ft wide. There are two throughmovement lanes and one left-tum lane in each approach. The yellow times for Vine Street and MapleStreet through movement and left-tum phases are 4 second and 3 seconds per g_hase, respectively. TheAll-red for each phase is 2.0 seconds and the ost time is 5 seconds per phase. Pedestrian walkmgspeed is 3.5 ft/sec. Assuming equal distribution of traffic on the two through-movement lanes in eachapproach and a saturation flow rate of 1,900 pcphpl. A 3-phase fixed timing signal plan (namely, aprotected left-turn phase, a NS phase, and an EW phase) is suggested.I) In the diagram, the through movement volume is for 2 lanes and left tum volume is for one-lane.2) Determine one N-S or E-W left tum phase on the…5. Find the level of service of the following road: (45 points) ▪ ▪ 6-lane multilane highway, terrain: 2 miles long 4% upgrade, speed limit: 55 mi/h lanes: 11ft, a two-way left-tum lane in the median, right shoulder: 5 ft, PHF: 0.90 peak hour traffic volume in each direction: 4500 veh/h with 10% SUTs and 5% TTs ▪ 30 access points in 2 miles ▪ Solution ET = 2.745 fHV = 0.792 Vp 2104 pc/h/In FFS = 50.15 mph c = 2083 pc/h/In S = 46.13 mph D = 45.61 pc/mi/In LOS FExercise 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 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 0.702Using Enumeration Method - list all paths and total duration. Activity Predecessor Normal time Normal cost Crash time Crash cost Max Crash Time Slope A - 12 $200 9 $350 B A 8 $300 8 $300 C A 9 $250 7 $450 D B 6 $400 5 $600 E B,C 5 $150 4 $225 F C 10 $500 9 $650 G D,E,F 8 $400 6 $900Design traffic repetitions value in msa.
- Q5a. Otwebeweate has been selected as the capital of a newly created district. As the new District Engineer, the Chief and the elders of the town approach you and make a request for the installation of a traffic light at one of the key intersections with the reason that there is no single traffic signal in the town and the installation of one will lift the status of the town as a district capital. What will be your decision and how will you explain it to the Chief and eldersAn 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 secHow many numbers of conflict are present in a 4-legged intersection? a.12 b.8 c.4 d.6
- Milel l 1431,62| g0 An Engineer has the following data for a highway segment o (Mpik)| 60 |5211 |34 22 k( Vely 431,62180 I .... a) Estimate the mean free flow speed and jammed density b) What are the maximum flow rate and corresponding density c) What are the average headway and spacing when k= 50 veh./mile solutionHow many crossing conflicts are present at a 4-leg intersection where each leg is a single lane approach, as shown above? Response Feedback: SBTH with WBTH, SBTH with NBLT, SBTH with EBLT, SBTH with EBTH NBTH with EBTH, NBTH with SBLT, NBTH with WBLT, NBTH with WBTH WBTH with EBLT, WBTH with SBLT, EBTH with WBLT, WBTH with NBLT EBLT with NBLT, EBLT with SBLT, WBLT with SBLT, WBLT with NBLTExplain detail project about (traffic and signal analysis) Systematic way