Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 6, Problem 6P
To determine
Density and occupancy.
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Data from a 6-ft by 6-ft inductive loop detector collected during a time period of 24 sec indicate that the mean speed of traffic is 52 mi/h among the 15 vehicles counted. Assume an average vehicle length of 19 ft. Determine the density (in veh/mi) and occupancy (percentage).
density ___________veh/mi
occupancy ___________%
Data from a 6-ft by 6-ft inductive loop detector collected during a time period of 24 sec indicate that the mean speed of traffic is 52 mi/h among the 15 vehicles counted. Assume an average vehicle length of 19 ft. Determine the density (in veh/mi) and occupancy (percentage).
density____________veh/mi
occupancy ______________%
Data from a 6-ft by 6-ft inductive loop detector collected during a time period of 33 sec indicate that the mean speed of traffic is 52 mi/h among the 15 vehicles counted. Assume an average vehicle length of 19 ft. Determine the density (in veh/mi) and occupancy
(percentage).
density
occupancy
veh/mi
%
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Chapter 6 Solutions
Traffic and Highway Engineering
Ch. 6 - Prob. 1PCh. 6 - Prob. 2PCh. 6 - Prob. 3PCh. 6 - Prob. 4PCh. 6 - Prob. 5PCh. 6 - Prob. 6PCh. 6 - Prob. 7PCh. 6 - Prob. 8PCh. 6 - Prob. 9PCh. 6 - Prob. 10P
Ch. 6 - Prob. 11PCh. 6 - Prob. 12PCh. 6 - Prob. 13PCh. 6 - Prob. 14PCh. 6 - Prob. 15PCh. 6 - Prob. 16PCh. 6 - Prob. 17PCh. 6 - Prob. 18PCh. 6 - Prob. 19PCh. 6 - Prob. 20PCh. 6 - Prob. 21PCh. 6 - Prob. 22PCh. 6 - Prob. 23PCh. 6 - Prob. 24PCh. 6 - Prob. 25PCh. 6 - The arrival times of vehicles at the ticket gate...Ch. 6 - Prob. 27P
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- Data from a 6ft by 6ft inductive loop detector collected during a 60 second interval indicates that the mean speed of traffic is 50mph among the 32 vehicles counted. Assume an average vehicle length of 19ft. Calculate a. The density, b. The occupancy, and C. The flow rate during this interval.arrow_forwardData obtained from aerial photography showed six vehicles on a 600 ft – long section of road. Traffic data collected at the same time indicated an average time headway of 4 sec. Determine (a) the density on the highway, (b) the flow on the road, and (c) the space mean speed.arrow_forward5. Calculate the minimum passing sight distance required for a two-lane rural roadway that has a posted speed limit of 45 mi/h. The local traffic engineer conducted a speed study of the subject road and found the following: average speed of the passing vehicle was 47 mi/h with an average acceleration of 1.43 mi/h/sec, and the average speed of impeder vehicles was 40 mi/h.arrow_forward
- Nonearrow_forwardCalculate the minimum passing sight distance required for a two-lane rural roadway that has a posted speed limit of 45 mi/h. The local traffic engineer conducted a speed study of the subject road and found the following: average speed of the passing vehicle was 47 mi/h with an average acceleration of 1.43 m/h/sec, and the average speed impeder vehicles was 40 mi/h. Show your solutions.arrow_forwardStudies have shown that the traffic flow on a two-lane road adjacent to aschool can be described by the Greenshields model. A length of 0.5 miadjacent to a school is described as a school zone and operates for a periodof 30 min just before the start of school and just after the close of school.The posted speed limit for the school zone during its operation is 15 mi/h.Data collected at the site when the school zone is not in operation showthat the jam density and mean free speed for each lane are 125 veh/mi and57 mi/h. If the demand flow on the highway at the times of operation ofthe school zone is 90% of the capacity of the highway, determine: The speeds of the shock waves created by the operation of the schoolzone, and• The number of vehicles affected by the school zone in the upsream ofthe zone during this 30-minute operation.arrow_forward
- PLEASE ANSWER ANY TWO A)A roadway with a capacity of 4000 vph has 15 minute arrivals of 1000, 500, 500, and 2000 during the peak hour. The queue at the end of the hour is most likely. B)A 3ft detector is used along a highway to help measure density. What is the density (in vpmpl) if the detector is occupied 50 percent of the time. Assume 28 ft veh length. C)If vehicles arrive at a rate of 360 vph, what is the probability of exactly 2 vehicles arriving in 20 seconds? (2 to decimals) D)How many vehicles have "arrived" if for 3 straight 15 minute periods the arrival rates are 240 vph, 400 vph, 600 vph?arrow_forwardNeed type answer The T-intersection has 2,400 collision incidents over the last three years. The annual daily traffic is shown in the figure below Determine the accident rate of the intersection.arrow_forwardData obtained from aerial photography showed six vehicles on a 200 metre long section of road. Traffic data collected at the same time indicated an average time headway of 4 sec. Determine (a) the density on the highway, (b) the flow on the road, and (c) the space mean speed.arrow_forward
- Two set of students are collecting traffic data at the two sections A and B 300 meters apart long a highway . Observation at A shows that 5 vehicles pass that section at intervals of 9 sec , 10 sec, 11 sec, 13 sec, and 15 sec respectively. If the speed of the vehicles were 84, 76, 68, 60 and 52 kph, compute the time mean spee (kph), space mean speed (kph), density of the highwayarrow_forwardWrite your step by step solutionarrow_forwardAn incident occurs on a freeway that has a capacity in the north bound direction, before incident, of 4000 veh/h and a constant flow of 2900 veh/h during the morning commute (no adjustments to traffic flow result from the incident). At 8:00am, a vehicle crash closes the freeway to all traffic. At 8:12am, the freeway is partially opened with a capacity of 2000 veh/h. Finally, the crash site is removed and the freeway is restored to full capacity of 4000 veh/h at 8:31am. Assuming the traffic follows a D/D/1 queueing (FIFO queue discipline) to determine time of queue dissipation, longest queue length, total delay, average delay per vehicle, and longest wait of any vehicle.arrow_forward
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