5-4. A freeway detector records an occupancy of 0.15 for a 15-minute period. If the detectoris 6 ft long, and the average vehicle has a length of 20 ft, what is the density implied bythis measurement?

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Answered: 5-4. A freeway detector records an…

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 6P

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A driver hit a pedestrian resulting in minor injuries. He was claiming that he followed the posted design speed at 80 kph (running speed368 kph) and perceived the design speed wasn't correct. Investigate the engineer's claim. (Prove by computation) a.) Was the driver's claim correct? b.) If yes, what should be the posted design speed? If not, what might be the other reasons for the pedestrian accident? Accident Report: - Driver was able to see the pedestrian 80 m ahead - Coefficient of friction 0.4 - Grade of the highway is zero - Time of accident: 8 AM - Weather condition: Fair - skid marks were not clear
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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: b. What is the % lane occupancy?
At an impaired driver checkpoint, the time required to conduct the impairment test varies (according to an exponential distribution) depending on the compliance of the driver, but takes 60 seconds on average. If an average of 30 vehicles per hour arrive (according to a Poisson distribution) at the checkpoint, determine the average time spent in the system in minutes/vehicle. Answer in whole number.
At an impaired driver checkpoint, the time required to conduct the impairment test varies (exponentially distributed) depending on the compliance of the driver, but takes 60 seconds on average. If an average of 30 vehicles per hour arrive (according to a Poisson distribution) at the checkpoint, determine the average time spent in the system.
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This is a three-part question. Data obtained from aerial photography showed eight vehicles on an 800 ft-long section of road. Traffic data collected at the same time indicated an average time headway of 3.7 sec. Part A. Determine the density on the highway in vehicles per mile. Part B. Determine the flow on the road in vehicles per hour. Part C. Determine the space mean speed in mph.
3. An engineering student at Siliman Universty is driving on a level roadway and sees a construction sigh 600 feet ahead in the middle of the roadway. The student strikes the sign at a speed of 35 mph. If the student was traveling at 55 mph when the sign was first spotted, what was the student's associated perception/reaction time? Assume that the deceleration is 11.2 ft/s?.
The average of 24-hour traffic counts collected over a number of days greater than one but less than a year.
Question 7 Data obtained from aerial photograph showed eight vehicles on 200 m long section of road. Traffic data collected at the same time indicated an average time headway of 3 sec. Determine: a) the density on the road b) the flow on the road c) the speed What type of speed is this? Explain.
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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 % Need Help? Read It Watch It

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5-4. A freeway detector records an occupancy of 0.15 for a 15-minute period. If the detector is 6 ft long, and the average vehicle has a length of 20 ft, what is the density implied by this measurement?