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If there are 50 vehicles on a 4000-ft highway lane and the average time headway between...
1. What is the flow rate if the average headway between 100 vehicles is 5 seconds?...
1. What is the flow rate if the average headway between 100 vehicles is 5 seconds? 2. What is the difference between time-mean speed and space-mean speed? 3. How would you observe the speed, flow, and density of a roadway? Using Greenshields, what is the speed of traffic if the free flow speed is 70 miles per hour, the current density is 70 vehicles per mile, and the jam density is 70 vehicles per mile? 4. What is the speed...
The traffic on a two-way two-lane highway is assumed to follow Greenberg model. The average headway...
The traffic on a two-way two-lane highway is assumed to follow Greenberg model. The average headway at Capacity is 1.9 seconds while the average spacing at jam conditions is 9 meters. At 9:00 AM on a typical weekday, two platoons were travelling on the highway in the eastbound direction. The length of the first platoon is 3 km and the average vehicle speed in this platoon is 62 km/h. The second platoon is a long platoon that starts directly to...
A six-lane divided highway (three lane in each direction) is on rolling terrain with two access...
A six-lane divided highway (three lane in each direction) is on rolling terrain with two access points per mile and has 10-ft. lanes, with a 5-ft. shoulder on the right side and a 3-ft. shoulder on the left side. The peak-hour factor is 0.80, and the directional peak-hour volume is 3000 vehicles per hour. There are 6% large trucks, 2% buses, and 2% recreational vehicles. A significant percentage of nonfamiliar roadway users are in the traffic stream (the driver population...
3. (20 pts) Two aerial photographs were taken 30 seconds apart over one east-bound lane of l-80 n...
3. (20 pts) Two aerial photographs were taken 30 seconds apart over one east-bound lane of l-80 near Grand Island, NE. The following results were recorded. Position from start of road section Vehicle 2000 2300 1700 1200 600 2940 3200 2400 2100 1730 1000 2 3 4 Plot the trajectories of the vehicles on graph paper and compute the average flow (vph), density (veh/mi) and space mean speed (mph) over the 3000 ft length of the lane.
3. (20 pts)...
Problem #2 A section of a six-lane highway (3 in each direction) with a two-way-left-turn lane...
Problem #2 A section of a six-lane highway (3 in each direction) with a two-way-left-turn lane (TWLTL) is being designed. Determine the level of service if the following data are applicable to this section. Traffic Data: • • • Directional design hour volume = 3600 veh/h (all are passenger cars) Peak-Hour-Factor (PHF) = 0.94 Base Free-Flow-Speed (FFS) = 55 mi/h Geometric data: • • • • • Urban setting Rolling terrain Lane width = 11 ft Shoulder width = 4...
QUESTION THREE On an urban highway, the relationship between vehicle speed and density can be represented...
QUESTION THREE On an urban highway, the relationship between vehicle speed and density can be represented by the Greenburg Model as the data in Table 3.1. Due to the roadwork on this highway, the width of both traffic lanes is narrowed and a bottleneck to traffic flow forms. The maximum flow on the unobstructed highway is 5000 vehicles per hour whilst on the section under repair the maximum flow is 4000 vehicles per hour. When the traffic flow approaching the...
Principles of transportation engineering The volume at a section of two lane highway is 1500 veh/h......
Principles of transportation engineering
The volume at a section of two lane highway is 1500
veh/h...
DONT FORGET PART B
3. (10 pts) The volume at a section of a two-lane highway is 1500 veh/h in each direction and the density is about 25 veh/mi. A large dump truck is loaded with soil from an adjacent construction site joins the traffic stream and travels at a speed of 10 mi/h for a length of 2.5 mi along the upgrade before...
An eight-lane freeway (four lanes in each direction) is on rolling terrain and has 11-ft lanes...
An eight-lane freeway (four lanes in each direction) is on rolling terrain and has 11-ft lanes with a 4-ft right-side shoulder. The total ramp density is 1.5 ramps per mile. The directional peak-hour traffic volume is 5400 vehicles with 400 large trucks and 6% buses. The peak- hour factor is 0.92. It has been decided that large trucks will be banned from the freeway during the peak hour. How much will the ban reduce expected traffic density and the level...
Question 1 3 pts Density (k) is expressed in units of O Vehicles per Mile O...
Question 1 3 pts Density (k) is expressed in units of O Vehicles per Mile O Vehicles per Hour O Miles per Hour Question 2 3 pts Time Mean Speed is typically greater than Space Mean Speed O True O False Question 3 3 pts If the space mean speed segment, the roadway density is vehicles per mile of traffic on a roadway segment is 50 miles per hour and 200 vehicles per hour are traveling on the
6, Traffic Shockwave theory (15%) Vehicles approaching an signalized intersection are traveling at speed 40 miles...
6, Traffic Shockwave theory (15%) Vehicles approaching an signalized intersection are traveling at speed 40 miles per hour and the density is about 40 vehicle/miles/lane (vehicle arrival). The red light last about 40 sec. If the saturation flow is 1900 vehhr/lane with a density of 52 veh/miles/hour (queue discharging). and the jam density is 120 veh/mile lane, please determine: a. the queue length at the end of the red light: b. the maximum queue length: c. The time it takes...
1. What is the flow rate if the average headway between 100 vehicles is 5 seconds? 2. What is the difference between time-mean speed and space-mean speed? 3. How would you observe the speed, flow, and density of a roadway? Using Greenshields, what is the speed of traffic if the free flow speed is 70 miles per hour, the current density is 70 vehicles per mile, and the jam density is 70 vehicles per mile? 4. What is the speed...
The traffic on a two-way two-lane highway is assumed to follow Greenberg model. The average headway at Capacity is 1.9 seconds while the average spacing at jam conditions is 9 meters. At 9:00 AM on a typical weekday, two platoons were travelling on the highway in the eastbound direction. The length of the first platoon is 3 km and the average vehicle speed in this platoon is 62 km/h. The second platoon is a long platoon that starts directly to...
3. (20 pts) Two aerial photographs were taken 30 seconds apart over one east-bound lane of l-80 near Grand Island, NE. The following results were recorded. Position from start of road section Vehicle 2000 2300 1700 1200 600 2940 3200 2400 2100 1730 1000 2 3 4 Plot the trajectories of the vehicles on graph paper and compute the average flow (vph), density (veh/mi) and space mean speed (mph) over the 3000 ft length of the lane.
3. (20 pts)...
Problem #2 A section of a six-lane highway (3 in each direction) with a two-way-left-turn lane (TWLTL) is being designed. Determine the level of service if the following data are applicable to this section. Traffic Data: • • • Directional design hour volume = 3600 veh/h (all are passenger cars) Peak-Hour-Factor (PHF) = 0.94 Base Free-Flow-Speed (FFS) = 55 mi/h Geometric data: • • • • • Urban setting Rolling terrain Lane width = 11 ft Shoulder width = 4...
QUESTION THREE On an urban highway, the relationship between vehicle speed and density can be represented by the Greenburg Model as the data in Table 3.1. Due to the roadwork on this highway, the width of both traffic lanes is narrowed and a bottleneck to traffic flow forms. The maximum flow on the unobstructed highway is 5000 vehicles per hour whilst on the section under repair the maximum flow is 4000 vehicles per hour. When the traffic flow approaching the...
Principles of transportation engineering
The volume at a section of two lane highway is 1500
veh/h...
DONT FORGET PART B
3. (10 pts) The volume at a section of a two-lane highway is 1500 veh/h in each direction and the density is about 25 veh/mi. A large dump truck is loaded with soil from an adjacent construction site joins the traffic stream and travels at a speed of 10 mi/h for a length of 2.5 mi along the upgrade before...
An eight-lane freeway (four lanes in each direction) is on rolling terrain and has 11-ft lanes with a 4-ft right-side shoulder. The total ramp density is 1.5 ramps per mile. The directional peak-hour traffic volume is 5400 vehicles with 400 large trucks and 6% buses. The peak- hour factor is 0.92. It has been decided that large trucks will be banned from the freeway during the peak hour. How much will the ban reduce expected traffic density and the level...
Question 1 3 pts Density (k) is expressed in units of O Vehicles per Mile O Vehicles per Hour O Miles per Hour Question 2 3 pts Time Mean Speed is typically greater than Space Mean Speed O True O False Question 3 3 pts If the space mean speed segment, the roadway density is vehicles per mile of traffic on a roadway segment is 50 miles per hour and 200 vehicles per hour are traveling on the
6, Traffic Shockwave theory (15%) Vehicles approaching an signalized intersection are traveling at speed 40 miles per hour and the density is about 40 vehicle/miles/lane (vehicle arrival). The red light last about 40 sec. If the saturation flow is 1900 vehhr/lane with a density of 52 veh/miles/hour (queue discharging). and the jam density is 120 veh/mile lane, please determine: a. the queue length at the end of the red light: b. the maximum queue length: c. The time it takes...
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