Homework Answers
iii) As traffic flow as constant and distance in same so
Average density = 25.888 veh/km
Average speed = 67.6 km/hr
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The traffic on a two-way two-lane highway is assumed to follow Greenberg model. The average headway...
If there are 50 vehicles on a 4000-ft highway lane and the average time headway between...
If there are 50 vehicles on a 4000-ft highway lane and the average time headway between two adjacent vehicles is 2.2 seconds. 3. Calculate traffic density in vehicle/mile (vpm) and average space headway in feet/vehicle (fpv) (1pt) 1) 2) Calculate traffic volume in vehicle/hour (vph). (1pt) 3) Calculate space-mean speed of the traffic on that lane. (1 pt)
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...
Exercise 1 [I8 pts]. Two lanes of a three-lane highway are closed because of road works...
Exercise 1 [I8 pts]. Two lanes of a three-lane highway are closed because of road works on a 2 km long segment. A detector placed on one single lane in the undisturbed zone upstream the road works detects a flow of 2,000 veh/h and an average speed of 100 km/h. A second detector placed on one of the two lanes just upstream the roadwork zone detects a flow of 800 veh/h and an average speed of 40 km/h. We observe...
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...
Traffic on a three-lane freeway observes a triangular flow-density relationship with free-flow speed vf=100km/h, capacity c=2000veh/h/lane,...
Traffic on a three-lane freeway observes a triangular flow-density relationship with free-flow speed vf=100km/h, capacity c=2000veh/h/lane, jam density kj=150veh/km/lane. Flow in the freeway from upstream is 5000veh/h, while the ramp flow is negligible (almost zero).At 9:45am, an accident occurs at point A. The vehicles involved close one lane of traffic (total capacity reduces to 4000veh/h) for 15min and afterwards the scene is clear (capacity returns to 6000veh/h). Lucy enters the freeway via the ramp at point B at 10:00am. Distance...
Q3. A Class I two-lane highway has a base free-flow speed of 110 km/h. Lane width...
Q3. A Class I two-lane highway has a base free-flow speed of 110 km/h. Lane width is 3.35 m and shoulder width is 0.6 m. There are 5 access points per km. The roadway is located in rolling terrain with 40% no-passing zones. The two-way traffic volume is 600 veh/hr with PHF = 0.86. The directional split is 60/40. Traffic includes 8% trucks and 2% recreational vehicles. Determine the level of service (LOS).
5. Traffic on Route 15 south of Selinsgrove was observed at two different times. The first...
5. Traffic on Route 15 south of Selinsgrove was observed at two different times. The first observation found a flow rate of 1,863 vehicles per hour per lane and a density of 85 vehicles per mile. The second observation found a flow rate of 1,050 vehicles per hour per lane and a density of 25 vehicles per mile. Using this data, compute the following: a. For both observations, determine the vehicle speed [mph] and the time headway [sec] b. If...
Please clearly show all steps. Answers are in red. On a specific westbound section of highway,...
Please clearly show all steps. Answers are in red.
On a specific westbound section of highway, studies show that the speed-density relationship is: 1. 3.6 It is known that the capacity is 3600 veh/h and the jam density is 215 veh/mi. a. What is the density at the point of maximum flow? 140.7 veh/mi b. What is the spacing between vehicles at this density? 19.20 ft/veh Assume an average vehicle length of 220 inches c. What is the space-mean speed...
Five-minute average speed in km/h and flow rate in veh/h during 12 hours were collected from...
Five-minute average speed in km/h and flow rate in veh/h during 12 hours were collected from a section of the eastbound lanes of Highway 401 in Toronto. The collected data were plotted to form the scatter diagram shown in the figure below. A curve was drawn to describe the general relationship between speed and flow rate q as shown in the figure. 120 300 Speed km/h 60 1000 Flow Rate vel (a) From the above speed-flow rate curve, determine the...
Problem 2 (Traffic Steam Characteristics): For the same lane as described in Problem 1, a snapshot...
Problem 2 (Traffic Steam Characteristics): For the same lane as described in Problem 1, a snapshot was taken at 9:01AM. The spacing between the front bumper of a vehicle and the front bumper of the following vehicle was measured as shown in the following table. Answer the following questions: Table 2: Spacing Data Vehicle ID Spacing (feet) 1 / 2 101.8 3 179.4 4 142.3 5 99.6 6 81.9 7 77.1 8 105.4 (1) Determine the average spacing. (2) Determine...
If there are 50 vehicles on a 4000-ft highway lane and the average time headway between two adjacent vehicles is 2.2 seconds. 3. Calculate traffic density in vehicle/mile (vpm) and average space headway in feet/vehicle (fpv) (1pt) 1) 2) Calculate traffic volume in vehicle/hour (vph). (1pt) 3) Calculate space-mean speed of the traffic on that lane. (1 pt)
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...
Exercise 1 [I8 pts]. Two lanes of a three-lane highway are closed because of road works on a 2 km long segment. A detector placed on one single lane in the undisturbed zone upstream the road works detects a flow of 2,000 veh/h and an average speed of 100 km/h. A second detector placed on one of the two lanes just upstream the roadwork zone detects a flow of 800 veh/h and an average speed of 40 km/h. We observe...
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...
Q3. A Class I two-lane highway has a base free-flow speed of 110 km/h. Lane width is 3.35 m and shoulder width is 0.6 m. There are 5 access points per km. The roadway is located in rolling terrain with 40% no-passing zones. The two-way traffic volume is 600 veh/hr with PHF = 0.86. The directional split is 60/40. Traffic includes 8% trucks and 2% recreational vehicles. Determine the level of service (LOS).
5. Traffic on Route 15 south of Selinsgrove was observed at two different times. The first observation found a flow rate of 1,863 vehicles per hour per lane and a density of 85 vehicles per mile. The second observation found a flow rate of 1,050 vehicles per hour per lane and a density of 25 vehicles per mile. Using this data, compute the following: a. For both observations, determine the vehicle speed [mph] and the time headway [sec] b. If...
Please clearly show all steps. Answers are in red.
On a specific westbound section of highway, studies show that the speed-density relationship is: 1. 3.6 It is known that the capacity is 3600 veh/h and the jam density is 215 veh/mi. a. What is the density at the point of maximum flow? 140.7 veh/mi b. What is the spacing between vehicles at this density? 19.20 ft/veh Assume an average vehicle length of 220 inches c. What is the space-mean speed...
Five-minute average speed in km/h and flow rate in veh/h during 12 hours were collected from a section of the eastbound lanes of Highway 401 in Toronto. The collected data were plotted to form the scatter diagram shown in the figure below. A curve was drawn to describe the general relationship between speed and flow rate q as shown in the figure. 120 300 Speed km/h 60 1000 Flow Rate vel (a) From the above speed-flow rate curve, determine the...
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