Using Greenshields' model, for a highway with a mean free flow speed of 76 mi/h and jam density of 128 veh/mi, determine the density (in veh/mi) when the mean speed is observed to be 58 mi/h: 30.3 35.3 41.1 58 None of the above
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- A section of highway has a speed–flow relationship of the form q = au2 + bu, where q is the traffic flow in veh/h, u is the space-mean speed of traffic in mi/h, and a and b are unknown parameters. It is known that at capacity (which is 3100 veh/h) the spacemean speed of traffic is 28 mi/h. Determine the speed when the flow is 1500 veh/h and the free-flow speed.7.11 A four-lane highway has a free-flow speed of 100 km/h and the flow-density relationship shown below. (1) Plot the relationship between flow and density. From this equation, determine (2) the flow capacity of the highway. Calculate (3) the jam density and (4) the speed at capacity and determine (5) the level of service when the highway is at capacity. q=100k-0.5k² lutionchin shown below.H.w Try only ten): 1. The flow is zero on the highway only if the density equals to zero. 2. Density is the number of vehicle passing during a given width of lane of roadway. 3. If an accident occure during the way, it could be say that it is uninterreputed flow. 4. Mobility for arterial road is grater than the mobility of local road. 5. 85 th percentile of spot speed cumulative curve represents the highway speed limit. 6. One of the most important of on street parking is mechanical garage. 7. As angle of parking increase, more accidents would be occure. 8. At jam density, density of flow is zero. 9. PHF of rural region is less than the PHF in urban region. 10.Stopping time delay occure ar intersection. 11.Future traffic includes only generated and developed traffic. 12.As the tunover duration of the parking increase, operation of the parking increases also.
- 1. (a) The following relationship between traffic speed and flow applies to a particular urban highway:- q = 192u - 44u In u where q = flow in veh/hr. u= speed in km/hr. Calculate the following:- (i) (iii) The mean speed when the highway flow is at maximum capacity The capacity of the highway The density at maximum flow capacity The space mean free speed The jam density (b) Plot diagrams to show the relationships between flow, speed and density given Question 1(a). Use these diagrams to describe what happens when flow changes from uncongested to congested along the highway.Choose the right answer a rural highway on a level terrain has the following traffic composition: 40 % Passenger cars 30 % trucks 20 % buses 10 % recreational vehicles Find the total volume expressed as pcu/hr. if the total volume is 6000 veh/hr. * a-7620 b-7630 c-7640A freeway traffic stream was observed to have a density of 22.0 veh/mi/ln when the mean speed was 55.0 mi/h. On another occasion at the same location, the jam density was found to be 132 veh/mi/ln. Assume Greenshields' model of traffic flow applies. The optimum speed (in mi/h) is: a) 22.0 b) 33.0 c) 55.0 d) 66.0 e) None of he above
- 9. A segment of a highway was designed for a free flow speed of 90 mph. At the time of observation along the segment, it was recorded that same segment was at its maximum flow. What is the average speed of vehicles at this instant? a) 60 kph b) 45 kph c) 55kph d) 75kph 10. In Problem 9, what is the density of vehicles at maximum flow? a) 1/3 jam density b) 1/4 jam density c) 1/2 jam density d) none of theseA section of highway having a length 60 m. The observed data are 6 vehicles cross over it in a period of 148 sec., for the following duration: 2.4, 2.8, 3.0, 2.1, 2.2, and 3.5 sec. Estimate the values of the flow rate, density, space-mean speed, time-mean speed, average gap, and average clearance. If the length of vehicles are 6, 5.4, 6.6, 4.8, 7.5, and 6 m respectively?On a specific westbound section of highway, studies show that the speed-density relationship is: It is known that the capacity is 5200 veh/h and the jam density is 310 veh/mi. What is the a.) space-mean speed of the traffic at capacity, (mph) b.) and what is the free-flow speed? (mph)
- The space mean speed (kmph) and density (vehicles/km) of a traffic stream are linearly related. The free flow speed and jam density are 80 kmph and 100 vehicles/km respectively. The traffic flow (in vehicles/h, up to one decimal place) corresponding to a speed of 40 kmph is SIIRDED3. If 5473 vehicles passes a certain lane of road with an average speed of 60 kph, determine the appropriate spacing of the vehiclesA section of a freeway has a speed-density relationship as following: veh If density 30- then assuming a linear speed-density relationship, and the hr > speeds and densities of the freeway are shown in the table below: Speed (mile/hr) 45 60 Density (veh/hr) 90 60 Find: 1- Free-flow speed and Jam density. 2- The space-mean speed, flow, and density at freeway capacity. 3- The density and space-mean speed when the flow is 2250 (veh/hr).