Match the following to True/False. A. GPS devices are an example of mobile traffic sensors For the time-space diagram of a single-lane one-way road, the vehicle trajectories do not intersect with each other unless there is a crash. Pneumatic tubes detect vehicle presence by sending an electric signal to a roadside device. B. + Space mean speed may be greater than time mean speed in certain situations. A. True B. False

Match the following to True/False. A. GPS devices are an example of mobile traffic sensors For the time-space diagram of a single-lane one-way road, the vehicle trajectories do not intersect with each other unless there is a crash. Pneumatic tubes detect vehicle presence by sending an electric signal to a roadside device. B. + Space mean speed may be greater than time mean speed in certain situations. A. True B. False

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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We know that q=ku for traffic flow. If we measure speeds and densities at three points within a mile at the same time, which of the following is true? a. Average u will be the same at all three points b. Average k will be the same at all three points c. Average q (calculated) will be the same at all three points d. None of the above 6. 7. Headway is defined as the time between vehicles passing a fixed point on the road, measured from: a. Front bumper of first car to back bumper of second car b. Front bumper of first car to front bumper of second car c. Back bumper of first car to front bumper of second car d. None of the above
Results of traffic flow studies on a highway indicate that the flow-density relationship can be described by the expression. Us q=uck - If speed and density observations give the data shown below, develop an appropriate expression for speed versus density for this highway. (Use the following as necessary: k. Assume u is in mi/h and k is in veh/mi. Do not include units in your answer.) Speed (mi/h) Density (veh/mi) 11 ufk² kj 57 53 45 39 28 21 18 density at maximum volume 21 22 39 60 70 86 97 Determine the density (in veh/mi) at which the maximum volume will occur as well as the value of the maximum volume (in veh/h). 80 X Your response differs from the correct answer by more than 10%. Double check your calculations. veh/mi
Assume you're observing traffic on a single lane of a highway in a specific location. Calculate the traffic flow (veh/hr), average speed (mi/hr), and density in this lane (veh/mi). Mean headway = 3.8 seconds; spacing= (177.4) feet.
Q1. During a 60 seconds period, a loop detector is occupied by vehicles for the following times for the following, 0.34s (car1), 0.38s (car2), 0.40s (car3), 0.32s (car4) and 0.52s (car5). Estimate the value of flow, density and velocity. You can assume that length of the loop detector is equal to 10 feet and the average length of all vehicles is 20 feet. Vehicle Ground Loop Detection Circuit Ż
Express the following equation, the traffic density in veh/km when d is in m, in terms of number of vehicles per mile when d is in mi, ft, and yd. (Use the following as necessary: n, d.) 1,000n d k = when d is in mi when d is in ft when d is in yd k = k = k = nd 5280nd 1760nd X X X
5.11 This problem considers what values a solution of the traffic flow equation can have when using the Greenshields law, with UM = 1 and PM = 10. Assume that p(x, 0) = f(x) is piecewise constant. Show Transcribed Text (c) Give an example for f(x), so that the only values p takes on are 1, 2, and 3.
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?
It takes about 3 s for a driver having 0.1% alcohol in his system to react to a situation to avoid a collision. If such drivers are traveling on a straight road at 45.5 ft/s and their cars can decelerate at 2.64 ft/s^2, determine the shortest stopping distance d (in feet) from the moment they see the pedestrians. The Correct answer is 528.59. Show solution.
1 Which of these statements are always true? 1. Fully actuated signals are better than pre- timed fixed signals. 2. Traffic flow becomes random upon approaching an intersection when volume is low. 3. Traffic flow becomes random upon approaching an intersection when the distance between two intersections is significantly long enough. 4. Programs of many sets of parameters are better than a program of single set of parameters to suit different traffic flow demand.' O 1, 2 2,3 3, 4 2, 3, 4 1, 2, 3 All of 1, 2, 3, 4 None of 1, 2, 3, 4
In the plot of cumulative vehicle arrivals and cumulative vehicle departure curves (y-axis) vs. time (x-axis), the queue disappears when: Group of answer choices The cumulative arrival = cumulative departure The cumulative departure = 0 The cumulative arrival = 0 The departure rate (or service rate) > arrival rate
4. The statistical data of an urban spot speed study is given below. A set of 130 observations of spot speeds made by timing vehicles through a "Trap" of 88ft. The stopwatch was used to obtain data. The stopwatch data are grouped into 0.2 sec. Classes. The first column of the table shows the midpoint of each group. The second column of the table shows the frequency of the observations. Compute the following statistical values. a) The speed of each time class in mph (show it in the third column) b) The cumulative percent of vehicles traveling at or below indicated speed shown in the third column in mph (show it in the forth column) c) Mean or average speed (time-mean speed), median, mode, standard deviation, standard error of the mean, average time, space-mean speed, variance, 15%, and 85% speed. d) Plot the cumulative percentage, and show the statistical values of item (c) on the graph. e) Plot the frequency distribution curve and show the statistical values on the graph.