I appreciate your help, thanks! The data shown below were obtained by time-lapse photography on a highway. Use regression analysis to fit these data to the Greenshields model and determine the following.Speed (mi/h) Density (veh/mi)18.58625.77135.15642.34253.457.32116(a) the mean free speed (in mi/h)80.2585xYour response differs from the correct answer by more than 10%. Double check your calculations. mi/h(b) the jam density (in veh/mi)94.0235xYour response differs from the correct answer by more than 10%. Double check your calculations. veh/mi(c) the capacity (in veh/h)2227×Your response differs from the correct answer by more than 10%. Double check your calculations. veh/h(d) the speed at maximum flow (in mi/h)40.1293×Your response differs from the correct answer by more than 10%. Double check your calculations. mi/h

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Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter6: Fundamental Principles Of Traffic Flow

Section: Chapter Questions

Problem 13P

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The data shown below were obtained by time-lapse photography on a highway. Use regression analysis to fit these data to the Greenshields model and determine the following. Speed (mi/h) Density (veh/mi) 16.7 84 25.7 69 35.2 54 43.1 40 54.4 19 56.1 14 (a) the mean free speed (in mi/h) mi/h (b) the jam density (in veh/mi) veh/mi (c) the capacity (in veh/h) veh/h (d) the speed at maximum flow (in mi/h) mi/h
The data shown below were obtained by time-lapse photography on a highway. Use regression analysis to fit these data to the Greenshields model and determine The mean free speed The jam density The capacity The speed at maximum flow Speed(mi/h) Density (veh/mi) 14.2 85 24.1 70 30.3 55 40.1 41 50.6 20 55 15
For a spot speed study in which 100 observations were obtained, the mean speed was 52km/h and the standard deviation was 4.6 km/h. 1.What is the margin of error on the estimate of true mean speed obtained from this sample? 2.What is a reasonable estimate of the 85th percentile speed based on the information available? Use N = ( )2 in your determinations. In addition read up on 85th percentile speed.
The data shown below were obtained by time-lapse photography on a highway. Use regression analysis to fit these data to the Greenshields model and determine the following. Speed (mi/h) Density (veh/mi) 19.7 28.8 35.2 43.1 53.8 57.0 (a) the mean free speed (in mi/h) 67.24 mi/h 86 71 56 42 21 16 (b) the jam density (in veh/mi) 105.06 X Your response differs from the correct answer by more than 10%. Double check your calculations. veh/mi (c) the capacity (in veh/h) 52.53 X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. veh/h (d) the speed at maximum flow (in mi/h) 33.61 mi/h
3 During a traffic speed survey, the following observations were recorded when a vehicle passes a 50 m long road section XY. Vehicle Time of Passing X (seconds) Time of Passing Y (seconds) 1 4.5 5.8 6.1 6.3 7.5 23 4 5 2.0 3.5 4.0 4.5 5.5 Determine the following: (i) Average time mean speed (ii) Average space mean speed using the above data (iii) Also verify the results obtained in (ii) above using relationship between the time mean speed and space mean speed.
For a spot speed study in which 100 observations were obtained, the mean speed was 52 km/h and the standard deviation was 4.6 km/h. (BO0K: Traffic % Highway engineering, N. Gruber SI unit) What is the margin of error on the estimate of true mean speed obtained from this sample? What is a reasonable estimate of the 85th percentile speed based on the information available?
Consider the following spot speed data, which were collected from the location of expressways operating under free flow conditions: a. Draw the frequency curve and cumulative frequency for this data. b. Find and identify on the curve: average speed, modud speed, pace, percent of vehicles in pace. c. Calculate the mean and standard deviation of the velocity distribution. d. What are the confidence bounds in the true mean velocity estimate of the underlying distribution with a 95% confidence level? With a 99.7% confidence level? e. Based on the results of this study, a second study should be conducted to achieve a tolerance of ±1.5 mi/hour with a 95% confidence level. What is the required sample size? f. Can this data deserve to be declared as normal?
1. Data on density and speed were obtained from a four-lane, two-way rural highway (in one direction only): Fitting the recorded data using linear regression, determine: a.the speed-density relationshipb.the correlation coefficientc.The capacity of the road.
please help us in this sample problem with a choices of a. 76.07 b. 76 c. 75.07 please base your answer on the given choices thank you
7) In studying of traffic flow at a highway toll booth over a course of 60 minutes, it is determined that the arrival and departure rates are deterministic, but not uniform. The arrival rate is found to vary according to the function A(t) = 1.8+0.25t - 0.00312. The departure rate function is u(t) = 1.4 +0 .1lt. In both of these functions, t is in minutes after the beginning of the observation and (t) and „u(t) are in vehicles per minute. At what time does the maximum queue length occur? a) 49.4 min, b) 2.7 min ,c) 19.4 min, d) 60.0 min
Engineering /Civil Engineering /Transportation Engineering
Problem 2: The following data are taken from 5 vehicles observed from photographs taken 3 seconds apart. Compute the space mean speed, in kph. Vehicles Distance( m) 1 38.4 2. 35.4 3 32.8 4 36.6 37.5

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