A 12 ft long loop detector has observed six vehicles that have crossed the device in a 148 second period, for the following durations: 0.44; 0.48; 0.5; 0.41; 0.49; and 0.55. The six vehicles are 18, 21, 20, 23, 17 and 19 ft respectively. Calculate: a. How long is the total time for the detector to be occupied?

A 12 ft long loop detector has observed six vehicles that have crossed the device in a 148 second period, for the following durations: 0.44; 0.48; 0.5; 0.41; 0.49; and 0.55. The six vehicles are 18, 21, 20, 23, 17 and 19 ft respectively. Calculate: a. How long is the total time for the detector to be occupied?

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter10: Capacity And Level Of Service At Signalized Intersections

Section: Chapter Questions

Problem 1P

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A 12 ft long loop detector has observed six vehicles that have crossed the device in a 148 second period, for the following durations: 0.44; 0.48; 0.5; 0.41; 0.49; and 0.55. The six vehicles are 18, 21, 20, 23, 17 and 19 ft respectively. Calculate: e. How many vehicles per hour current value, q?
A 12 ft long loop detector has observed six vehicles that have crossed the device in a 148 second period, for the following durations: 0.44; 0.48; 0.5; 0.41; 0.49; and 0.55. The six vehicles are 18, 21, 20, 23, 17 and 19 ft respectively. Calculate: d. How many miles per hour is the rated speed, v?
A 12 ft long loop detector has observed six vehicles that have crossed the device in a 148 second period, for the following durations: 0.44; 0.48; 0.5; 0.41; 0.49; and 0.55. The six vehicles are 18, 21, 20, 23, 17 and 19 ft respectively. Calculate: c. How many vehicles per mile is the density, k?
A) What is the time-mean speed? Present your answer in units of [feet/sec] to two decimal places? B) What is the spacing between the vehicles in Image 1? Present your answer to the nearest foot. C) I calculate that the (average) density obtained from these images is 18.2 [veh/mi]. Assume that this value is correct, even if I made a mistake.If a loop detector sensing these vehicles was occupied 5% of the time, what is the average length of the vehicles? Present your answer in units of feet to one decimal place.
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
A 12 ft long loop detector has observed six vehicles that have crossed the device in a 148 second period, for the following durations: 0.44; 0.48; 0.5; 0.41; 0.49; and 0.55. The six vehicles are 18, 21, 20, 23, 17 and 19 ft respectively. a. How long is the total time for the detector to be occupied? b. What is the % lane occupancy? c. How many vehicles per mile density value, k? d. How many miles per hour is the rated speed, v? e. How many vehicles per hour current value, q?
A 12 ft long loop detector has observed six vehicles that have crossed the device in a 148 second period, for the following durations: 0.44; 0.48; 0.5; 0.41; 0.49; and 0.55. The six vehicles are 18, 21, 20, 23, 17 and 19 ft respectively. Calculate: b. What is the % lane occupancy?
Two detectors are placed 235 feet apart on the Taconic State Parkway. A vehicle activates the first loop 88.51 seconds, and activates the second loop at 91.38 seconds, how fast is the vehicle moving in miles per hour? Ansure
A photograph is to be obtained at a scale of 1:12,500 by aerial photogrammetry. If the focal length of the camera to be used is 7.0 in., determine the height (in ft) at which the aircraft should be flown if the average elevation of the terrain is 860 ft. 7410 Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error, ft Need Help? Read It
1. If the signal phase designation shown below follows the NEMA convention, the value of "a" and "e" respectively should be: 2 Heaviest Movement e b a а. 1 and 8 b. 4 and 5 с. 1 and 4 d. 3 and 4 2. Which of the following is (are) common accident exposure measure(s) for a highway section? a. Fatality b. Vehicle-Kilometer с. Роpulation d. All of the above 3. Which of the following is (are) possible choice(s) of safety performance index? а. Speed b. Асcident c. Traffic conflicts d. All of the above
Determine the density (in veh/mi) of a traffic stream comprised mainly of passenger cars, for which a 6-ft long detector measured an occupancy of 17%. Assume an average vehicle length of 18 ft. A. 37.4 B 41.3 C 49.9 D Insufficient information is provided. E None of the above
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.