The optimum speed and the optimum density for the high-speed freeway data set is assumed to be 40 miles per hour and 50 vehicles per mile per lane, respectively. Determine the equations for the Greenberg, Underwood, and Northwestern models, and construct flow-speed-density relationships in a fashion similar to Figure Question 1b. Speed (miles/hr)Flow (veh/hr/lanelSpeed (miles/hr)605040302010-02400200016001200800400060504030201001010120 3020GreenshieldsGreenbergUnderwood- Northwestern50 60 70 80100 110 120 130Density (veh/mile/lane)50 60 7080100110 120 130Density (veh/mile/lane)800 1000 1200 1400 1600 1800 2000 2200 2400 2600Flow (veh/hr/lane)Figure Question 1b200 400 6004030 409090

Answered: 99 Under Nath

Engineering

Civil Engineering

99 Under Nath

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter9: Capacity And Level Of Service For Highway Segments

Section: Chapter Questions

Problem 17P

See similar textbooks

Related questions

Q: 5. Is there a difference between the slope from plot and the slope of the value (1-Cos)? Why?

A: Fluid mechanics : When matter constantly deforms (flows) when subjected to shear stress, fluid…

Q: Determine void ratio Porosity=0.142

A: Given data : The value of porosity=n n=0.142 Required : Void ratio

Q: ELEV. = 65m A L = 1500m D = 750mm Q = 1.2 m3/s ELEV. = ?? C D L = 1800m D = 450mm A three reservoir…

Q: 4. A force of 540N is directed from C towards E in the cube. a. Determine the moment about the…

Q: The I-section has the dimensions (in mm) shown in the figure. Calculate the second moment of area…

Q: An equal tangent vertical curve is intended to connect grades of 4.8% and -3%. If this curve is to…

Q: A saturated specimen of cohesionless sand was tested under drained conditions in a triaxial…

Q: What is the Slenderness Ratio? KL/r Using LRFD, what is the ultimate load capacity of the column?…

Q: 1. A member is formed by connecting a steel bar to an aluminum bar is shown. Assuming that the bars…

Q: Analyze the given beam using the method of Three-Moment Equation. Draw also the shear and moment…

Q: 1. EXAMPLE 11.2 Calculate the station of the BC and EC. You are given the following information:…

A: Deflection angle, ∆=12°51'Radius of curve, R=400mThe station of point of intersection, PI=0+241.782

Q: A 16 KN/m 21 5 m B 41 6 m 25 KN/m t

Q: Problem. Draw the shear and moment diagram of the beam loaded as shown in Fig 60 KN 30 kN 2m R₂ R₁…

A: The length of beam, l=7mThe support reactions are R1A support & R2B supportThe loads applied ar…

Q: Determine the area bounded by a straight road and an irregular boundary using the data given below:…

Q: t vertical curve has its PVI at elevation 491.52ft. The ini™ on of a point 327ft from PVC. your…

Q: A stratum of normally consolidated clay of thickness 10 ft is drained on one side only. It has a…

Q: The motion of a particle is defined by the relation x = t³-t²- 20t + 10 where x and t are expressed…

Q: The table below lists the number of audience impression (in hundreds of millions) listening to the…

Q: Determine the magnitude of the tension at support B (N). Supports are pin connected B.) Determine…

Q: The steel tie-bar shown in the figure has been designed to carry a tension force of 80 kN when…

Q: Consider the cantilever beam shown below. A triangular distributed load of with a maximum value of 2…

Q: single-span which carries a uniform load of 26 kN/m applied on the narrow side of the beam has an…

Q: A cylindrical sample of soil having a cohesion of 80 kN/m2 and an angle of internal friction of 20°…

Q: 120 kips k 15'- B E 1 15' D 15'- 80 kips VC 20'

A: To determine deflection at any point unit load is applied and member forces to be determined. The…

Q: Determine FEMAB of the beam with uniform distributed load of 70 kN/m, 7 meters from the left fixed…

Q: What power will be required in kW if the water will be delivered to 1.5m above the pump?

Q: Describe pycnometer method for determining water content of soil.

A: To Describe: pycnometer method for determining water content of soil.

Q: SFD and BMD. Locate points of cont the elastic curve and compute the de 8 kN 8 kN 20 kN-m C

Q: A grain size analysis is performed on 3500 g of dry sand. No soil is retained on the 12.5-mm opening…

Q: A simply supported rectangular concrete beam has a clear span of 6m. Has a width of 400 mm and has…

Q: Example 9.6 A square of 6 ft sides is to be subdivided into three equal parts by two straight lines…

A: Given: A square of 6 ft side is divided into three equal parts by two straight lines parallel to…

Q: For a three-hinged parabolic arch, what will be the ratio L/R to satisfy H = W?

A: Given: in a three hinged arch H=W To find: L/R

Q: What should be the observation and analysis for sieve analysis of fine aggregate if the value of…

A: Fineness Modulus 3.7 Cu= 4.1 Cc= 1.1 % error = 1.8% Cu= 4.1 between 4-6 Hence well graded sand Cc=…

Q: Example 9.5 Calculate the area of the underground roadway from the measurements given. Assume the…

Q: closed traverse is as follows:

A: Given: Station X (Easting) Y (Northing) 1 0 0 2 53 56 3 108 115 4 165 177 5 224 242 6…

Q: The steel tie-bar shown in the figure has been designed to carry a tension force of 98 kN when…

Q: Situation 4: A steel plate is 300 mm wide and 15 mm thick with 4 bolts (24mm dia.) cut into the…

Q: Draw the shear and moment diagrams for the following beam. (Show all your work including finding the…

Q: Design a one way slab to carry a live load of 4500Pa and a dead load of 3525Pa. The slab has a…

Q: The beam shown in the figure is supported at roller A and pinned at B and has a uniformly…

A: The algebraic sum of the vertical forces at any section of a beam to the right or left of the…

Q: altermate design pad of 30 kN/m, under the following conditions: concrete unit weight, Yc = 23.5…

A: Given: L=4m, Deadload=25 kN/m, Liveload=30kN/m fc'=28 MPa, fy=420 MPa db=32 mm

Q: Problem 3. Object B weighs 100 lb. The brown cable that passes over pulley D and around pulley C…

A: This question is related to the Engineering Mechanics.

Q: B 3 m A 4 m D C 4 m E P

Q: t is desired to obtain information about the in-situ strength properties cohesion and angle of…

Q: two tangents converge at an angle 27.3 degrees, which were connected by a reverse curve. The…

Q: In a constant head permeability test, a soil sample is compacted into a round PVC pipe and placed…

Q: An embankment consists of clay fill for which c=25 kPa and angle of internal friction is 260 9from…

Q: A spiral Easement Curve has a length of 120m, with central angle of Radius 600m. if the bearing of…

A: Given that Length = 120m Radius = 600m

Q: Solve each problem using the method of least work.

Q: A B C mmmmm MI "a" 5.0m "b" D 3.0m E "2" F

Concept explainers

Capacity and Level of Service at Intersections

The term capacity is associated with transportation engineering. Capacity helps to understand how many pedestrians or vehicles can be handled by a transport facility. Level of service is also a term associated with transportation engineering. The level of service indicates the performance of the transport facility.

Question

The optimum speed and the optimum density for the high-speed freeway data set is assumed to be 40 miles per hour and 50 vehicles per mile per lane, respectively. Determine the equations for the Greenberg, Underwood, and Northwestern models, and construct flow-speed-density relationships in a fashion similar to Figure Question 1b.

Speed (miles/hr)
Flow (veh/hr/lanel
Speed (miles/hr)
60
50
40
30
20
10-
0
2400
2000
1600
1200
800
400
0
60
50
40
30
20
10
0
10
10
1
20 30
20
Greenshields
Greenberg
Underwood
- Northwestern
50 60 70 80
100 110 120 130
Density (veh/mile/lane)
50 60 70
80
100
110 120 130
Density (veh/mile/lane)
800 1000 1200 1400 1600 1800 2000 2200 2400 2600
Flow (veh/hr/lane)
Figure Question 1b
200 400 600
40
30 40
90
90

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1 Solution:-

VIEW

Step 2 Solutions:-

VIEW

Step 3 Solution:-

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Capacity and level of service at intersections

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.

Similar questions

Q3: Given the ordinate of 2 hr. UH. Drive the ordinate of 8-hr. U.H? T(hr.) 2-h UH 300 720 800 540 10 300 12 170 14 100 16 50 18 10 20 22
sl ina The speed at maximum flow _is equal to half of space mean speed O time mean speed O free flow speed O
A plank L m long is placed in a horizontal position with its ends resting on two inclined planes as shown. The angle of friction is p. Determine how close the load P can be placed near B before slipping impends.
Part 2 - Solving: Observers stationed at two sections A-A and B-B, 200 m apart on a highway, record the arrival times of four vehicles as shown in the table. %3 Vehicle Section A-A Section B-B To + 7.6 sec To + 10.4 sec To + 15.1 sec I To + 23.4 sec If the total time of observation at A-A was 20 seconds, determine: (a) the time mean speed in A To + 4.2 sec To + 8.7 sec To + 13.7 seC B C KPH, (b) the space mean speed in KPH, (c) the flow at section A-A in veh/hr, (d) time headway in seconds, and (c) traffic density in veh/km. 5 points each.
nents A subway train stops at two stations that are 2km apart The max acceleration and deceleration of the train are 2 m/s^2 and 16 m/s^2 respectively and the max allowable speed Is 20m/s. Which of the following gives the shortest possible time of travel between two station. (Hint Think carefully, same with our example problem.) ers nis
Two helicopters, H1 and H2, are traveling together. At the time t 0, they separate and follow different straight line paths given by H1: x = 6+ 40t y = -3+ 10t z = -3+2t H2: x 6+ 110t y = -3+ 4t z = -3+t Time t is measured in hours and all coordinates are measured in miles. Due to an error, H2 stops its flight at (446, 13, 1) and lands at (446, 13, 0). Two hours later, H is informed about H2 and moved toward H2 at 175 mph. How long will it takes Hi to reach H2?
Estimate the maximum number of cars in a single lane of traffic that would pass a check-point in one hour at an average speed of 50 mph. Safe driving practice requires one car length of spacing for each 10 mph speed. (a) Layout the procedure for making the estimation including assumptions, diagrams, equations, etc.
3. A train moves slowly along a straight portion of track according to the graph of position versus time in the figure below. Find
- From the traffic studies performed along a street shows the distances each vehicle traveled every 3 seconds on a portion of the highway. Vehicle Distance, m 1 82.6 2 89.9 3 84.6 4 82 a.computethe space mean speed of the traffic, in kph.b.computethe flow of traffic.c.computethe density of traffic.
2hd Semester, SY 2021-2022 / College of Engineering / Bachelor of Science in Civil Engineering A freight train starts from rest and travels with a constant acceleration of 0.5 ft/s 2. After a time t' it maintains a constant speed so that when t = 160 s it has traveled 2000 ft. Determine the time t' and draw the v-t graph for the motion. Maximum file size: 50MB, maximum number of files: 1
uestion 18 The density of traffic in a certain observation point on a highway was recorded to be 30 veh/km. If the space mean speed of the vehicle is 50 kph, how many vehicles will be passing every 30 minutes O A. 25.5 O B. 750 O C. 12.5 O D. 13 O E. None of the above «
At a certain instant, two cars, A and B, are 600m apart. At this instant, A has a speed of 24km/hr and accelerating 0.9m/s2, while B is moving toward A with a speed of 48km/hr and accelerating 0.6m/s2. Determine The time they will meet A 18.916s B 20.184s C) none D) 17.936s (E) 15.087s