● ● ● Fundamental diagrams (flow vs. density) diagrams: capacity, critical density, speed, jan density Levels of service (LOS) and its advantages and disadvantages Pre-timed (fixed time) vs. actuated signals Different types of intersections.
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- QUESTION 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?QUESTION 6 RING 1 RING 2 $1 1 CAL $5 MAJOR STREET $2 O none $6 BARRIER = Phase Number = Protected Movement $3 MINOR STREET $4 = Permitted Movement Pedestrian Movement BARRIER In this ring and barrier diagram, what sequencing is used for the protected left turns? O lead-lead lead-lag lag-lag5. 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 F
- $1 $5 MAJOR STREET 42 lead-lag lag-lag none 46 BARRIER -Phase Number -Protected Movement 43 MINOR STREET LU Permitted Movement >-Pedestrian Movement BARRIER In this ring and barrier diagram, what sequencing is used for the protected left turns? lead-leadThe 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…Design traffic repetitions value in msa.
- Explain detail project about (traffic and signal analysis) Systematic wayGiven an arterial with 20 consecutive signals, spaced at 1,500 ft with vehicles moving at 50 ft/s, which coordination scheme is the best: simultaneous, altenate, or double alternate? What cycle length should be used?RING 1 RING 2 $1 2 сл lead-lag lag-lag MAJOR STREET none $2 $6 BARRIER Phase Number Protected Movement $3 MINOR STREET $4 = Permitted Movement Pedestrian Movement In this ring and barrier diagram, what sequencing is used for the protected left turns? lead-lead BARRIER
- 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/hrHow many numbers of conflict are present in a 4-legged intersection? a.12 b.8 c.4 d.616 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 page