2(a) c) The average length of each vehicle in a traffic stream is 7.0M, and the average distance between each vehicle is 2.0M. The headway at maximum flow is 1.5 seconds. Determine; (i) (ii) the jam density the speed at maximum flow
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- The free flow speed of a portion of the highway is 60 mph and a jam density of 100 veh/mile. Use Greenshield Model. Compute the speed in mph when flow is maximum 30 O 7.75 O 15 O 120An accident occurs on a one-lane highway and blocks off all lanes of traffic. This freeway has a jam density of 130 veh/mi. Before the accident occurred (and upstream of the queue that forms), traffic was (is) traveling at an average speed of 45 mi/h and density of 30 veh/mi. Assume that the following conditions are present: ● ● Before the queue: Uupstream = 45 mi/h, kupstream = 30 veh/mi After the queue: Udownstream = 60 mi/h, kdownstream = 0 veh/mi Jam Density: kj = 130 veh/mi How long is the queue after 25 minutes?An approach to a signal-controlled intersection has a width of 22 ft. and carries a flow of 600 vehicle/hr. The intersection is in a busy shopping street with many pedestrians. There is a 3% uphill gradient, 20% of the vehicles turn left without exclusive lanes for queueing in and 20% turn right. Knowing that the pcu factor is 1.12, then Saturation flow = Your answer Correction for turning traffie= Your answe Degree of saturation 551543 3:40 AM d) ENG 5/9/2022
- ..Average free flow speed and the jam density observed on a road stretch are 60 km/h and 120 vehicles/km, respectively. For a linear speed-density relationship, the maximum flow on the road stretch (in vehicles/h) is_1 The speed dersity Relationship of Traffic on a section of reeway lane was Vs = 18-2 In 220 D what is The Mex-flow, speed density at This flow What is The jam density d andThe free mean speed on a roadway is found to be 80 km/h. If the average spacing between vehicles is 7.5 m under jam condition, then the capacity flow is (in vehicles/hour/lane)
- The mean flow speed at a portion of the highway is 62.8 mph and a jam density of 110 vehicle/mile. a) Compute the density when the flow is maximum b) Compute the maximum capacity in vehicle/hour c) Compute the speed of maximum flowConsider the geometric and traffic characteristics shown below. Approach(Width) North(56 ft) South(56 ft) East(68 ft) West(68 ft) Peak hour Approach Volumes: Left Turn 155 95 190 156 Through Movement 442 395 585 538 Right Turn 172 167 201 210 Conflicting Pedestrian Volumes 900 1,200 1,200 900 PHF 0.95 0.95 0.95 0.95 For the following saturation flows: Through lanes: 1,600 veh/h/ln Through-right lanes: 1,400 veh/h/ln Left lanes: 1,000 veh/h/ln Left-through lanes: 1,200 veh/h/ln Left-through-right lanes: 1,100 veh/h/ln The total cycle length was 262 s. Now assume the saturation flow rates are 10% higher, that is, assume the following saturation flow rates: Through lanes: 1,760 veh/h/ln Through-right lanes: 1,540 veh/h/ln Left lanes: 1,100 veh/h/ln Left-through lanes: 1,320 veh/h/ln Left-through-right lanes: 1,210 veh/h/ln Determine a suitable signal phasing system and phase lengths (in s) for the intersection using the…Q/ Find the jam density for the section of road with normal flow (1200 veh/hr) and average space mean speed 60km/hr if you know that the maximum flow is 1800 ?veh/hr
- QUESTION 2 An intersection has a speed limit of 35 mph and the intersection is 33 ft wide. Our "design vehicle" is 20 ft long and can brake at 11.2 ft/sec2. If PIEV time is 1.4 seconds, what is the value of minimum safe clearance time (in seconds)?HW 3. A study of freeway flow at a particular site has resulted in a calibrated speed- density relationship as follows: For this relationship, determine: (a) the free-flow speed, (b) jam density, (c) the speed-flow relationship, (d) the flow-density relationship, and (e) capacity. S=32 *(2.5 -0.02 D)In a one-lane one-way homogeneous traffic stream, the observed average headway is 3.0s. The flow (expressed in vehicles/hr) in this traffic stream is 2 X