In a three-phase signal system design for a four-leg intersection, the critical flow ration for each phase are 0.18. 0.32 and 0.22. The total loss time in each of the phases i 2s. As per Webster's formula, the optimal cycle length (in s, round off to the neares integer) is
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- The normal flows on two approach roads at an intersection are respectively 500 pcu/h and 300 pcu/h. The corresponding saturation flow is 1600 pcu/h on each road. The total lost time per single cycle is 16 s. The optimum cycle time by Webster's method is A) 72.5 s B 58.0 s c) 48.0 s D) 19.3 sDetermine the maximum sum of critical volumes that a signalized intersection, with four phases and a cycle length of 120 seconds, can accommodate. Assume that the lost time per phase is equal to 3.5 seconds, and that the saturation discharge headway is equal to 1.9 seconds. Ans: 1,673 veh/hrDetermine the maximum sum of critical volumes that a signalized intersection, with four phases and a cycle length of 120 seconds, can accommodate. Assume that the lost time per phase is equal to 3.5 seconds, and that the saturation discharge headway is equal to 1.9 seconds. Ans: 1,673veh/hr
- Select the true items related to absorption capacity. Select only the four correct answers. Practical absorption capacity is usually less than theoretical absorption capacity. It is the minimum possible number of vehicles from the minor approach that can merge into the mainstream traffic per hour. Absorption capacity depends on the vehicle arrival rate at the minor approach. Practical absorption capacity is usually more than theoretical absorption capacity. Absorption capacity does not depend on the flow of the mainstream traffic. Absorption capacity depends on the flow of the mainstream traffic. Absorption capacity does not depend on the vehicle arrival rate at the minor approach. It is the maximum possible number of vehicles from the minor approach that can merge into the mainstream traffic per hour.A Cui separating the source and the sink. (iii) The capacity of a cut. (b) Find the maximum flow from the source to the sink using the labeling method. (c) Find the minimum cut, and verify the max-flow min-cut theorem. Consider a street network as shown below: 60 30 70 10 20 10 80 40 100 The numbers on the arcs represent the traffic flow capacities. The problem is to place one-way signs on streets not already oriented so as to maximize the traffic flow from the point s to the point n. Solve by the labeling method. 18. A certain commodity is to be shipped from three warehouses to four markets. The warehouse supplies are 20, 20, and 100 units. The market demands are 20, 20, 60, and 20 units. It is not possible to ship from all the warehouses to all the markets. The fol-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 20161
- Choose the correct answer 1. This maximum rate of discharge is refer to A. saturation flow B. Lost Time C. Effective Green D. Yellow Times 2. What is the total lost time for Intersection with 4 phases and lost time 3.5 per phase (assume no all red) A.12.5 Sec B.10.3 Sec С.14 Sec D.16 Sec 3. The optimum cycle length could be calculated through the equation 1.5 L+5 C = 1-E, В. 4 = Gai + T - Gi L = E, 4+R C. А. Gee = C-L = C -(E., 4+R) D. 4. The time in seconds required for one complete color sequence of signal indication is refer to A. All-red interval B. Interval С. Phase D. Cycle (Cycle Length) 5. Cycle length is always between A. (50- 60) Sec В.(80— 100) Sec С. (100- 200) Seс D. (62 -120) SecOn a city street, a transit line operates through signalised intersections. Each transit has three compartments, and each compartment can accommodate a maximum of 40 passengers. The acceptable green-to-cycle time ratio (g/C) to the particular street is 0.35. The clearance between successive transits should be 70 seconds. The passenger's dwell time is 110 secounds. The reduction factor for dwell time and arrival variation is 0.785. Estimate the capacity of the transit line in passengers/h. Answer: the capacity of the transit line = passengers/hour Report your answers to the nearest whole number without units (i.e., if your answer is 1720.258, you should enter 1720 or if your answer is 873.564, enter 874)Traffic flow on a single lane road is moving with a free flow speed of 40 kph anddensity of 50 vpk. This flow is stopped for 45 seconds at an intersection controlled by signals. Assume jam density of 250 vpk.i. What would be the speed and direction of the stopping wave? ii. What would be the length of the cars stopped? SHOW COMPLETE SOLUTION. NEED ASAP. THNAK YOU
- A single lane of a freeway with a free flow speed of 80 mph has a capacity of 2600 passenger car per hour lane. There is a flow of 880 passenger cars per hour per lane. Find jam density, the current per average speed and density. Use Greenshields's model. Traffic dota f-6-14 Briefly describe the different shock waves that can be formed and the traffic condi- tions that will result in each of these shock waves. 6.15 Traffic fow on a four-lane (one direction) freeway can be described by the Green.Subject: Transportation Engineering The traffic light just turns green at an intersection. The vehicles leaving the queue at u = 30mph, k = 60vpm and the vehicles from the upstream joining the queue at u = 60mph, k = 30vpm. The density in the queue is 130vpm and the queue length is 50ft. How long does it take for the queue to dissipate? Please help me urgent... Thank you