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
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- 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 these7.11 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.On a specific highway, the speed-density relationship follows the greenberg's model. The free flow velocity is 80 km/hr and jam density is 200 vehicles/km. When the highway is operating at maximum capacity, the density obtained as per this model is veh/km.
- A 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 aboveDetermine i) capacity, ii) jam density, iii) speed and iv) density at capacity of a traffic stream if the speed density relationship follows relation v = 17.2 ln(228/k), if v is space mean speed in km/hr and k is the density at veh/km.Question A linear relationship is observed between speed and density on a certain section of a highway. The free flow speed is observation to be 80 km per hour and the jam density is estimated as 100 vehicles per km length. Based on the above relationship, the maximum flow expected on this section and the speed at the maximum flow will respectively be
- A 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?Traffic on a three-lane (in each direction) freeway observes the following Greenshields flow relationship: V = 60D(1-D/360) where V is the traffic volume on vehicle per hour, and D is the traffic density in vehicles per mile. At 10:00 am, an accident occurs at point A (in the following Figure). The vehicles involved immediately pull off onto the shoulder of the roadway, but traffic passing the incident slows to 10 mph as drivers survey the damage on the side of the road (sometimes called "spectator slowing"). Lucy enters the freeway via the ramp at point B, also at 10:00 am. Upon entering the freeway, she notes that traffic on the freeway is moving along at about 40 mph. Scene at 10:00 am B Lucy 4 Miles A. How fast (i.e., at what speed) will back up from the "spectator slowing" progress upstream of the accident site? number only in units of miles per hour and rounded to the nearest whole number, i.e. XX.) B. When (i.e., at what time) will Lucy first hit slowing traffic due to the…The free flow speed of vehicles on a road section is considered as 80 km/hr and jammed density as 240 veh/km. Estimate the i) traffic density on the road section in maximum traffic flow conditions, ii) possible maximum flow rate for the road section, and iii) average speed of the vehicles at the maximum traffic volume.
- 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.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/hrThe 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 SIIRDED