The speed-density relationship for a particular road was found to be : u = 42.76 - 0.22 k, %3D where u is the speed in km per hour and k is the density in vehicles per km. Find the capacity of the road. Give your comment on the result. Sketch the relationship between density and flow and indicate important traffic flow parameters on it. Use IRC recommendation.

The speed-density relationship for a particular road was found to be : u = 42.76 - 0.22 k, %3D where u is the speed in km per hour and k is the density in vehicles per km. Find the capacity of the road. Give your comment on the result. Sketch the relationship between density and flow and indicate important traffic flow parameters on it. Use IRC recommendation.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter8: Intersection Control

Section: Chapter Questions

Problem 8P

See similar textbooks

Similar questions

Following table shows the prediction in the traffic of the road for a design period. Which one is the closest number to the design ESAL (W18) for this road (total ESAL) Load Number of Vehicle Type Equivalency Repeats Factor Compact car 0.0008 48,857,994 Buss 1.75 84,590 2 AX 0.7 497,585 З АХ 1.5 149,276 4 AX 2 84,590 5 AX 2.3 84,611 TAX (10,000 Ibs) 0.011 14,659 TAX (14,000 Ibs) 0.042 86,231 TAX (18,000 Ibs) 0.109 25,869 TAX (20,000 Ibs) 0.162 14,650 TAX (50,000 Ibs) 5.03 1,524 O 2.5 million O 0.75 million O 1.26 million 1.14 million
The table below shows data on speed and corresponding densities on a section of a collector road. It can be assumed that the traffic flow characteristics can be described by the greenberge model, develop an appropriate relationship between flow and density. Also deyerdete the capacity of this section of the road Speed kph density veh/km 60 20 46 32 40.8 38 39.3 40 35.7 45 32.6 50 30.8 53 28.4 57 24.7 65 18.5 80
17 An existing urban freeway with 4 lanes in each direction has the following characteristics: Traffic data: Peak hour volume (in the peak direction): 7070 veh/h Trucks: 10% of peak hour volume PHF _ 0.94 Geometric data: Lane width: 11 ft Shoulder width: 6 ft Interchange spacing (average): 1.4 mile Terrain: rolling Determine the LOS in the peak hour. Clearly state assumptions used for any values not given. Show the demand flow rate, mean speed, and density for the given conditions.
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.
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.
Given a freeway flow study at a certain highway. The speed- density relationship is described in thegiven equation or relationship:V s = 60- 0.48kDetermine the following:a. Free-flow speed and jam densityb. Derive the equation describing flow and speed.c. Derive the equation describing flow and density.d. Determine the capacity of highway
Problem-5 b, What is the theoretical capacity (in vehicle/hour/lane) of a traffic lane with one way traffic flow at a stream speed of 50 kmph? wwww [Assume the average space gap between vehicles to follow the relation Sg = 0.278 V.t. where 'V' is the stream speed in kmph, 't' is the average reaction time = 0.7 sec, average length of vehicles = 5.0 m]
Problem 6 Traffic on a single-lane urban street observes the following flow-density relationship: q=30k(1-k/180), where q is the traffic flow in vehicles per hour (VPH), and k is the traffic density in vehicles per mile (VPM). Answer the following questions: a. | Calculate the free flow speed, capacity, and jam density of the traffic flow. b. What is the minimum spacing and the minimum (time) headway of the traffic flow? What is the traffic volume when the travel speed is 20 MPH? C.
4. When the accident rate (instead of accident number) is used to identify hazardous location, there is bias towards selecting low-flow locations with few accidents. B. False A. True 5. If all cars on one lane move at 25 mph and all cars on the second lane move at 30 mph, the time mean speed and space mean speed calculated for the 2-lane highway will be the same: Α. True B. False
Based on a field traffic study, the flow-density relationship for a minor arterial street was found as Q= 44 D - 0.6 D2, then the density at .traffic jam condition is about . Veh./km 34 .a 53 .b 73 111 .d None .e C.
A 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.
Question 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.