Example-3Considering linear relationship between densityand speed, if the number of vehicle observedon a segment of road with length 1.2 km is 96veh. Knowing that the jam density is 100veh./km, calculate the following:1 The Spacing?2.The free flow speed when the flow rate is1600 veh/hr?3 Space mean speed ?Example-5The relation between the traffic flowcharacteristics for a highway follows therelationUs 100 0.8 k=Derivate the main relations between thetraffic flow characteristics for this highwayusing sketches to show your answer?Determine the speed and density at Q = 2000veh/hr?

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Example-3 Considering linear relationship between density and speed, if the number of vehicle observed on a segment of road with length 1.2 km is 96 veh. Knowing that the jam density is 100 veh./km, calculate the following: 1 The Spacing? 2. The free flow speed when the flow rate is 1600 veh/hr? 3 Space mean speed ?

Example-3 Considering linear relationship between density and speed, if the number of vehicle observed on a segment of road with length 1.2 km is 96 veh. Knowing that the jam density is 100 veh./km, calculate the following: 1 The Spacing? 2. The free flow speed when the flow rate is 1600 veh/hr? 3 Space mean speed ?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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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
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Example - Floating car method The data collected from speed and delay studies by floating car method on a stretch of urban road of length 3.5 km, running North-South are given below. Determine the average values of volume, journey speed and running speed & SMS of the traffic stream along either direction. Trip Direction of Journey trip time No. 1234S00 5 6 7 8 N-S S-N N-S S-N N-S S-N N-S S-N Total stop No. of delay vehicles Min-Sec Min-Sec overtaking 6-32 7-14 6-5 7-40 6-10 8-00 6-28 7-30 1-40 1-50 1-30 2-00 1-10 2-22 1-40 1-40 4552 M N N M 3 2 2 3 No. of vehicle overtaken 733L5252 1 No. of vehicles from opposite direction 268 186 280 200 250 170 290 160
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.
6. (a) Define the peak hour factor (PHF) (b) Explain the traffic condition when PHF=1. 7. The following table shows traffic flow data collected at the main road in an urban area, in two successive days during the peak period Day one Day two Time Flow (veh) Flow (veh) 7:30 – 7:45 900 7:45 – 8:00 950 960 8:00 – 8:15 1010 1015 8:15 – 8:30 990 980 (a) Determine the peak hour factor (PHF) (b) Estimate the missing traffic flow count (x) on day two.
Vehicle time headways and spacings were measured at a point along a highway, from a single lane, over the course of an hour. • Average time headway is 2.5 sec/veh • Average spacing is 200 ft/veh • Calculate density in veh/miles/lane. O 27 veh/mile/lane 25 veh/mile/lane O 18 veh/mile/lane O 500 veh/mile/lane
1) 1) A section of highway has the following flow-density relationship: q-50k-0.156k² What is the capacity (maximum flow) of the highway section, the space mean speed at capacity, and the density when the traffic flow on the highway is at one-quarter of its capacity? 2) An observer has determined that the time headways between successive vehicles on a section of highway are exponentially distributed (arrival of vehicle is Poisson distribution) and that 60% of the headways between vehicles are 13 seconds or greater. If the observer decides to count traffic in 30-second time intervals, estimate the probability of the observer counting exactly four vehicles in an interval.
Assume that the speed-density function of a section of highway follows Greenshield's Model. The free-flow speed is 75 mph and the jam density is 176 veh mi lane a. Derive V as a function of S. b. In 15 minutes, you have counted that V=150 veh 15 minute lane Estimate the two possible speeds S (in mph) during this 15 minute period.
Consider only a single lane of a highway. Based on extensive data from an urban freeway it is assumed thatfree-flow speeds (i.e., there are no jams) can best be represented by a Normal distribution with mean andstandard deviation 119 km/h and 13.1 km/h, respectively.1. What is the probability that the speed of a randomly selected vehicle is between 100 and 120 km/h?2. What is the expected number of vehicles between two vehicles that exceed the posted speed limit of100 Km/h? You can use the Z table for calculating the final answer. You can also write your final answer in form ofR functions or as PDF/CDF of statistical distributions with correct arguments.
From the following data of a freeway surveillance, there are 4 vehicles counted for a length of 200 m and the following distances each had travelled when observed on the photographs taken every 3 seconds apart. Compute the following:i. Density of flow in vehicles per km (vpk). ii. Space mean speed in kph. iii. Flow rate, in vehicles per hour. SHOW COMPLETE SOLUTION. NEED ASAP. THNAK YOU
Engineering /Civil Engineering /Transportation Engineering
Question 2 If the model In us= ln uf - k/kj is applicable to depict the correlation between speed (mi/h) and density (veh/mi) on a highway segment, and employing regression analysis provides the model constants Y = A + BX (where Y = In u, X = k) as A = 3.9 and B = -0.018, then calculate the: Jam density in veh/km. Express answer into two decimal places. Do not type the unit. veh/km.