Highway Engineering: Theory of Traffic Flow Studies have shown that the traffic flow on a 2 lane highway adjacent to school can be described by theGreenshield's model. A length of 0.50 km adjacent to a school is described as a school zone and operatesfor a period of 25 minutes just before the start of school and just after the close of school. The postedspeed limit for the school zone during its operation is 21 kph. Data collected at the site when school zone isnot in operation show that the jam density and mean free for each lane is 119 veh/km and 65 kphrespectively. If the demand flow on the highway at the time of the operation of the school zone is 95% ofthe capacity of the highway, calculate the following:a. Traffic shockwave created by the operation of the school zoneb.The queue length of vehicles affected by the school zone operationc. The number of vehicles affected by the school zone operationd.The time the queue of vehicles takes for it to dissipate after the operation of the school zonef. Plot the shockwaves showing capacity flow and jam density in the Q-k diagramNote: Do not copy the one in Chegg. It is incompleteUse 4 decimal places. Show full solutionTopic: Theory of Traffic Flow (Highway Engineering)

Answered: Image /qna-images/answer/b935f956-cb4c-4369-9a46-e24479c2a928.jpg

Studies have shown that the traffic flow on a 2 lane highway adjacent to school can be described by the Greenshield's model. A length of 0.50 km adjacent to a school is described as a school zone and operates for a period of 25 minutes 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 21 kph. Data collected at the site when school zone is not in operation show that the jam density and mean free for each lane is 119 veh/km and 65 kph respectively. If the demand flow on the highway at the tìme of the operation of the school zone is 95% of the capacity of the highway, calculate the following: a. Traffic shockwave created by the operation of the school zone b.The queue length of vehicles affected by the school zone operation c. The number of vehicles affected by the school zone operation d.The time the queue of vehicles takes for it to dissipate after the operation of the school zone f. Plot the shockwaves showing capacity flow and jam density in the Q-k diagram

Studies have shown that the traffic flow on a 2 lane highway adjacent to school can be described by the Greenshield's model. A length of 0.50 km adjacent to a school is described as a school zone and operates for a period of 25 minutes 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 21 kph. Data collected at the site when school zone is not in operation show that the jam density and mean free for each lane is 119 veh/km and 65 kph respectively. If the demand flow on the highway at the tìme of the operation of the school zone is 95% of the capacity of the highway, calculate the following: a. Traffic shockwave created by the operation of the school zone b.The queue length of vehicles affected by the school zone operation c. The number of vehicles affected by the school zone operation d.The time the queue of vehicles takes for it to dissipate after the operation of the school zone f. Plot the shockwaves showing capacity flow and jam density in the Q-k diagram

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 16P

See similar textbooks

Similar questions

Studies have shown that the traffic flow on a two-lane road adjacent to a school can be described by the Greenshields model. A length of 0.5 mi adjacent to a school is described as a school zone (see Figure 6.19) and operates for a period of 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 20 mi/h. Data collected at the site when the school zone is not in operation show that the jam density and mean free speed for each lane are 118 veh/mi and 63 mi/h. If the demand flow on the highway at the times of operation of the school zone is 95% of the capacity of the highway, determine: 6-13 (a) The speeds of the shock waves created by the operation of the school zone (b) The number of vehicles affected by the school zone operation (c) The time the queue takes for it to dissipate after the operation of the school zone
Studies 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.
Studies have shown that the traffic flow on a 2 lane highway adjacent to school can be described by the Greenshield's model. A length of 0.50 km adjacent to a school is described as a school zone and operates for a period of 25 minutes 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 21 kph. Data collected at the site when school zone is not in operation show that the jam density and mean free for each lane is 119 veh/km and 65 kph respectively. If the demand flow on the highway at the time of the operation of the school zone is 95% of the capacity of the highway, calculate the following: 2.1 Traffic shockwave created by the operation of the school zone 2.2 The queue length of vehicles affected by the school zone operation 2.3 The number of vehicles affected by the school zone operation 2.4 The time the queue of vehicles takes for it to dissipate after the operation of the school zone 2.5 Plot the…
2cb) The average speed of a 1st group of vehicles over a road msegment is per 45 km/h and their flow is 1350 vehicles hour. The average speed of a 2nd group of vehicles over the same segment is 40 km/h and their flow is 1800 hour. Determine the maximum flow of the vehicles per whole traffic stream? Wat mumiyan to booge all
The following data was collected during a study of two arterial lanes. Estimate the continuous 15-minute counts for the two-lane roadway as a whole. Find the peak hour, and compute the PHF.
1) A 6-lane two-way arterial road has a maximum flow of 6,000 vehicles per hour on one direction. It is operating at 3,600 vehicles per hour at time, t=0. A collision occurs, blocking the two lanes, and restricting the flow of the outermostlane to 1,600 vehicles per hour. After 40minutes, the police have cleared the middlelane from accident debris; the operating volume at that time increased to 2,400 vehicles per hour.20 minutes past, the innermost lane was finally cleared of the accident. Traffic returns to normalas soon as the queue has already immoderate. a.Determine the maximum length of queue that occurred. b.How long did it take to dissipate the queue? c.If a vehicle entered the road at t=10 minutes, how long will it take for it to leave the traffic?
The traffic demand for a six-lane urban arterial road (three lanes per direction) is given in the table below. The relationship between flow and density for this road follows GreenShiled's model, with a free flow speed of 105 km/h and a jam density of 92 veh/km/lane. Two of the three lanes of the EB direction were closed at 5:00 AM for maintenance. The two lanes were re-opened at 8:00 AM, allowing the traffic to be released at capacity conditions. a) What is the maximum length of the queue upstream of the bottleneck? b) At what time the queue upstream of the bottleneck will be fully dissipated? c) What is the furthest point upstream of the bottleneck that will be impacted by the lane closure? d) Draw the shock wave diagram showing shock wave speeds, critical times, and distances. Time 5:00 6:00 AM 6:00 7:00 AM 7:00 8:00 AM 8:00 9:00 AM 9:00 10:00 AM 10:00 11:00 AM Demand (vph) 2000 4000 6400 6000 3600 3000
9. Calculate the estimated free flow speed of a Class II two-lane highway if the field measured mean speed is 56.5 mph and the flow rate during the field data collection was 650 vph and all vehicles are passenger vehicles.
It is known that the capacity is 3800 veh/h and the jam density is 225 veh/mi. What is the space-mean speed of the traffic at capacity, and what is the free-flow speed? if chart or graph was used please attaxch below and explain how its used
A traffic volume of 900 vehicles/hour is observed at an approach intersection. Determine the peak flow rate in one hour for the peak hour factor following: 1.00, 0.90, 0.80, 0.70. Create plots and comment on the results.
4. Vehicle time headway is 3.5 sec/vehicle and spacing of cars measured at a point along the NLEX, from a single lane of 70 m/vehicle, over the course of an hour. Compute for the traffic density, space mean speed, and the average speed of the traffic.
Data 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.