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MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
5th Edition
ISBN: 9781305577398
Author: Nicholas J. Garber; Lester A. Hoel
Publisher: Cengage Learning US
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Question
Chapter 6, Problem 10P
To determine
To develop: an appropriate relationship between the flow, density and capacity of this section of road.
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Students have asked these similar questions
6-7
The table below shows data on speeds and corresponding densities on a section of a
rural collector road. If it can be assumed that the traffic flow characteristics can be
described by the Greenberg model, develop an appropriate relationship between the
flow and density. Also determine the capacity of this section of the road.
Speed (mi/h)
Density (veh/mi)
Speed (mi/h)
Density (veh/mi)
60.0
20
32.6
50
46.0
32
30.8
53
40.8
38
28.4
57
65
80
39.3
40
24.7
35.7
45
18.5
The traffic demand for a six-lane urban arterial road (three lanes per direction) is given in the table
below. The relationship between flow and density for this road follows GreenShiled's model, with
a free flow speed of 105 km/h and a jam density of 92 veh/km/lane. Two of the three lanes of the
EB direction were closed at 5:00 AM for maintenance. The two lanes were re-opened at 8:00 AM,
allowing the traffic to be released at capacity conditions.
a) What is the maximum length of the queue upstream of the bottleneck?
b) At what time the queue upstream of the bottleneck will be fully dissipated?
c) What is the furthest point upstream of the bottleneck that will be impacted by the lane
closure?
d) Draw the shock wave diagram showing shock wave speeds, critical times, and distances.
Time
5:00
6:00 AM
6:00 7:00 AM
7:00 8:00 AM
8:00 9:00 AM
9:00 10:00 AM
10:00 11:00 AM
Demand (vph)
2000
4000
6400
6000
3600
3000
ASAP
Chapter 6 Solutions
MindTap Engineering for Garber/Hoel's Traffic and Highway Engineering, 5th Edition, [Instant Access], 1 term (6 months)
Ch. 6 - Prob. 1PCh. 6 - Prob. 2PCh. 6 - Prob. 3PCh. 6 - Prob. 4PCh. 6 - Prob. 5PCh. 6 - Prob. 6PCh. 6 - Prob. 7PCh. 6 - Prob. 8PCh. 6 - Prob. 9PCh. 6 - Prob. 10P
Ch. 6 - Prob. 11PCh. 6 - Prob. 12PCh. 6 - Prob. 13PCh. 6 - Prob. 14PCh. 6 - Prob. 15PCh. 6 - Prob. 16PCh. 6 - Prob. 17PCh. 6 - Prob. 18PCh. 6 - Prob. 19PCh. 6 - Prob. 20PCh. 6 - Prob. 21PCh. 6 - Prob. 22PCh. 6 - Prob. 23PCh. 6 - Prob. 24PCh. 6 - Prob. 25PCh. 6 - The arrival times of vehicles at the ticket gate...Ch. 6 - Prob. 27P
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- 1. A study of freeway flow at a given site has yielded a relationship speed-density calibrated as follows: S = 57,5(1 - 0,008 D) For this relationship, specify: (a) free flow velocity, (b) congestion density, (c) velocity-flow relationship (d) flow density relationship, and (e) capacity. 2. Answer all the questions in Problem 1 for the calibrated density-velocity relationship the following: S = 61.2e^-0015Darrow_forward.) A study of freeway flow at a particular site has resulted in a calibrated speed- density relationship as follows: V=57.5 (1-0.008 D); From this relationship, Find the free flow speed and the Jam density. Derive equations describing flow versus speed and flow versus density.arrow_forwardQuestion 2 Because the new travel time rate (TTR) from the additional traffic (e.g., 300vph) exceeds the minimum acceptable local standard of 2.0 min/mile, it is proposed to increase the road capacity by 900vph/lane by adding one lane in each direction. Calculate the new travel time rate and traffic volume using: a. The traditional method of traffic impact analysis, and b. The above-mentioned pivot point analysis method. c. Compare the results of the two methods and comment on their significance.arrow_forward
- Given the following data on a certain highway section: uf=90km/hr and qcap=3600veh/hr Calculate the density corresponds to the flow value q=900veh/hrarrow_forwardA section of highway has a speed-flow relationship of the form "q = au^2 + bu" It is known that at capacity (which is 3100 veh/hr) the space mean speed of traffic is 28mi/hr. Determine the speed when the flow is 1500veh/hr and the free flow speed. Please show all steps.arrow_forwardAn arterial road having three lanes in each direction carries traffic quite well in the evening peak period until a car illegally parks, blocking one of the three lanes and forcing traffic to merge into the other two lanes. A traffic queue quickly builds up behind the parked car. The fundamental diagram for this road can be modelled using a triangular flow-density relationship, having a capacity (maximum flow) of 4500 vehicles per hour, a critical density of 100 vehicles per kilometre, and a jam density of 300 vehicles per kilometre. Note also that this road has three lanes. Assuming that the parked car remains and after a period of 45 minutes the arrival flow decreases from 3500 vehicles per hour to 2000 vehicles per hour. a) Identify traffic states (flow and density) on the above arterial road. Calculate the shockwave speeds and plot the shockwaves on the fundamental diagram. Plot the time-space diagram with some vehicle trajectories and showing the shockwaves in this time-space…arrow_forward
- Select one: is used in the qualitative evaluation of the operating conditions of the road. a. Headway b.Service volume c.Level of Service d.Density Which one of the following is NOT listed among the ideal traffic conditions? Select one: a. Traffic stream is consisting of only passenger cars b.Level terrain c.Most of the drivers are familiar with the road d.Six lanes in each directionarrow_forward4) Determine the level of service (LOS) for a freeway segment with the following data. Show all steps involved. Demand volume (3452 vehicle per hour) ● ● ● ● ● ● ● 1 Number of lanes (3 lanes in one direction) Width of lanes (11ft per lane) Lateral clearance on the right side of the freeway (4 ft) Total ramp density (2 miles between ramps, or 0.5 ramps per mile) Percent of heavy vehicles (5% trucks/buses and 0% recreational vehicles) Peak hour factor (0.927) I Terrain (level) Driver population factor (familiar drivers)arrow_forwardQuestion 4 One stretch of two-lane two-way roadway that traverses through level terrain is expected to carry 1400 vehicle per hour. Determine the Level of Service (LOS) in the peak direction for the road based on average travel speed (ATS) if the characteristics of the roadway are as follows: Table Q4-1 Percentage of Trucks Percentage of Recreational Vehicle Peak Hour Factor 10 0.97 60:40 60 Percent Directional Split Percent no-passing Zone Lane Widths Shoulder Widths Design Speed Road Length Access Points 3.35 m 1.2 m 96 km/h 8 km 10 access points per km State all assumption (if any) used in calculation..arrow_forward
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