Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 6, Problem 4P
To determine
Thespace mean speed and to compare the obtained answer with the previous problem for space mean speed.
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In a 500 m section of highway, there are 10 vehicles observed. The time headway is 4 sec. Determine the space mean speed of the vehicles in kph.
Assume you are an observer standing at a point along a three-lane roadway. All vehicles in lane 1 are traveling at 48 kph, all vehicles in lane 2 are traveling at 72 kph, and all vehicles in lane 3 are traveling at 97 kph. There is also a constant spacing of 75 m between vehicles. If you collect spot speed data for all vehicles as they cross your observation point, for 30 minutes, what will be the time-mean speed and space-mean speed for this traffic stream?
Assume you are an observer standing at a point along a three-lane roadway. All vehicles in lane 1 are traveling at 48 kph, all vehicles in lane 2 are traveling at 72 kph, and all vehicles in lane 3 are traveling at 97 kph. There is also a constant spacing of 75 m between vehicles. If you collect spot speed data for all vehicles as they cross your observation point, for 30 minutes, what will be the time-mean speed and space-mean speed for this traffic stream?
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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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- In a 600 m section of highway, there are 12 vehicles observed. Determine the time headway if thespace mean speed of the vehicles is 60 kpharrow_forwardRepeat the previous problem, only now the driver of car A is traveling at VA = 130 km/h as it passes P, but over the next 5 seconds, the car uniformly decelerates to the speed limit of 100 km /h, and after that the speed limit is maintained. If the motion of the police car P remains as described in the previous problem, determine the distance required for police officer to overtake car A. Ans. 330 marrow_forwardThe Data below shows the result of the flow of traffic at a certain part of a highway by observing the arrival times for four vehicles at two sections A and B that are 150 m apart. the total observation time at section A is 15 sec. determine the flow at section A.arrow_forward
- A car travels from A to B with an avetage speed of 80kph and back to A without loss of time at an average speed of 100 kph. a.Determine the distance between A and V if the shortest time covered was 45 mins. b. Determine its average velocity for the entire trip c. determine the average speed of the entire triparrow_forwardCompute the rate of flow in veh/hr if the space mean speed is 35 mph and the density of traffic is 17 veh/km a.959 veh/hr b.956 veh/hr c.957 veh/hr d.958 veh/hrarrow_forwardTraffic is observed at a single lane of a highway at a specific location. The average headway and average spacing of passing vehicles are measured as 3.5 seconds and 192 ft., respectively. Calculate the average speed (mph), flow (veh/hour), and density (veh/mile) of the traffic stream in this lanearrow_forward
- Assume you are observing traffic in a single lane of a highway at a specific location. You measure the average headway and average spacing of passing vehicles as 3.2 seconds and 20 m, respectively. Calculate the flow, average speed, and density of the traffic stream in this lane. thank youarrow_forwardCalculate the setback distance on a national highway having horizontal curve of radius 300 m and length of 180 m. Assume speed of 80 km/h and coefficient of friction of 0.35 and perception-reactions time of 2.5 seconds.arrow_forward1. The rate flow at a point in the highway is 1200 vehicles/hour. Find the space mean speed in mph if the density of traffic is 25 vehicles per mile 2. Assume you are observing traffic in a single lane of McArthur Highway at a specific location. You measure the average headway and average spacing of the vehicles as 3.2sec. and 50 m. respectively. Determine the traffic speed in kilometer/hourarrow_forward
- Compute the rate of flow in veh/hr if the space mean speed is 35 mph and the density of traffic is 17 veh/km.arrow_forwardAssume you are an observer standing at a point on a three lane race track. All vehicles in lane 1 are traveling at 50 mi/h, all vehicles in lane 2 are traveling at 65 mi/h, and all vehicles in lane 3 are traveling at 70 mi/h. There is a constant spacing of 0.25 mile. If you collect spot speed data for all vehicles that pass your observation point in one hour, what will the time-mean speed be for the traffic stream?arrow_forwardA section of highway has a speed–flow relationship of the form q = au2 + bu, where q is the traffic flow in veh/h, u is the space-mean speed of traffic in mi/h, and a and b are unknown parameters. It is known that at capacity (which is 3100 veh/h) the spacemean speed of traffic is 28 mi/h. Determine the speed when the flow is 1500 veh/h and the free-flow speed.arrow_forward
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