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- Task 3: The Intersection design a. Describe the various principles involved in the design of at-grade intersections and the different types of at-grade intersections. Also, give an example of an appropriate location for the use of each type. b. Design a suitable signal phasing system and phase lengths for the intersection using the Webster method. Show a detailed layout of the phasing system and the intersection geometry used for the geometric and traffic characteristics shown in table 6 below. And the saturation flow of the intersection is shown in table 7 Discuss the effect of increasing saturation flow rates by 10% higher on the cycle length? Table 6:The geometric and traffic characteristics of the intersection Approach (Width) North (56m) South (56 m) East (68m) West (68m) Peak hour approach volumes Left turn 133 73 168 134 Through movement 420 373 563 516 Right turn 140 135 169 178 Conflicting pedestrian volumes 900 1200 1200 900 PHF 0.95 0.95 0.95 0.95…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?Please calculate the level of service and delay for the westbound left lane group, the westbound approach, and the whole intersection. I provided LOS chart for reference.
- b) What are the main disadvantages of traffic signal controlled intersection in Kumasi.What are the considerations for installing traffic signals? briefly classify the traffic signal including example?QUESTION 3 What is the intersection sight distance (ft) needed at a yield controlled intersection for a passenger car to turn left onto a 2- way, 2-lane road with a design speed of 50 mph? [round to the nearest foot]
- QUESTION 4 What is the intersection sight distance (ft) needed at a yield controlled intersection for a passenger car to turn right onto a 2- way, 2-lane road with a design speed of 50 mph? [round to the nearest foot]The geometric and traffic characteristics are shown below, determine a suitable signal phasing system and phase lengths for the intersection using the Webster method. Show a detailed layout of the phasing system and the intersection geometry used. South Approach S6 fi North East West Approach 56 fi Approach Approach 68 f Арproach Widih Peak-hour approach volume Left turn Through movement Right turn PHF Confilicting pedestrian volume 900 ped/hr 1200 ped/hr 1200 ped/hr 900 ped/hr 133 420 73 168 134 373 135 563 516 178 140 169 0.95 0.95 0.95 0.95 Assume the following saturation flows: Through lanes: 1760 vehIn/h Through and right lanes: 1540 veh/In/h Left lanes: 1100 veh/n/h Left and through lanes: 1320 veh/in/h Left, through, and right lanes: 1210 veh/n/ha) At certain on-street parking, determine the number of parking spaces required to park vehicles in angles (0°, 45°, and 90° degree) if the length of the curb =240 ft, then show the layouts with dimensions. b) Briefly describe the classification of parking facilities and the methodology of parking studies. c) A traffic engineer records the travel times for six vehicles (1.35, 1.15, 1.75, 1.4, 1.8, and 1.4 minutes). These vehicles are traveling a 0.75-mile segment of a highway. Determine space mean speed (SMS) and time mean speed (TMS).
- Two adjacent signalized intersections along a major arterial are 650 ft apart (stop line to stop line distance). If the space mean speed between these two intersections is 22 mph, what should be the signal offset of the downstream intersection relative to the upstream intersection? Group of answer choices 20.0 sec 13.5 sec 40.0 sec 29.5 secClassify the different types of traffic signs and mention the general objective of each type of sign; with sketch. Also show the general shape of these types of signs. ( Do according to Indian traffic standard)Design the intersection given the following vehicular volumes per leg in pcu.