Question

In: Civil Engineering

Assume the speed and density at a freeway location follows a linear relationship.You observe traffic flow...

Assume the speed and density at a freeway location follows a linear relationship.You observe traffic flow rate of 2250 vehicles/hour at 45 mph and 3000 vehicles/hour at 30 mph. What are the jam density, free flow speed (max speed), and capacity of this freeway location? How about the density and speed (i.e., the critical density and the critical speed) at the capacity?

Solutions

Expert Solution


Related Solutions

A freeway is being designed for a location in mountainous terrain. The expected free-flow speed is...
A freeway is being designed for a location in mountainous terrain. The expected free-flow speed is 88.5 km/h. Lane widths will be 3.6 m and shoulder widths will be 1.8 m. During the peak hour, it is expected there will be a directional peak- hour volume of 2700 vehicles, 12% large tracks and buses and 6% recreational vehicles. The PHF and driver population adjustment are expected to be 0.88 and 0.90, respectively. If a level of service no worse than...
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...
1. Traffic speed is investigated at a certain section of freeway. Mean speed is 73mph. Sample...
1. Traffic speed is investigated at a certain section of freeway. Mean speed is 73mph. Sample standard deviation was 20 mph. There were 24 samples. A researcher claims the actual speed on that freeway is more than 76 mph. What would be the null hypothesis? null hypothesis= H0: μ=76, Alternative hypothesis= H1: μ>76. One Tail test. This is the only information I was given. 2. Find the critical value
. In three sentences or less, explain why traffic density and speed are related.
. In three sentences or less, explain why traffic density and speed are related.
Assuming a linear speed-density relationship. the mean free speed is observed to be 65 mph at...
Assuming a linear speed-density relationship. the mean free speed is observed to be 65 mph at near zero density and the corresponding jam density is 160 veh/mi. Assume that the average length of vehicles is 20 feet. a) Write down the equations for speed-density and flow-density relationships b) Calculate the speed and density corresponding to a flow of 1000 veh/hr c) Calculate the average time headway and average space headway when the traffic flow is at maximum value
Transportation: Which is more significant in reducing free flow speed on a freeway, narrower lanes or...
Transportation: Which is more significant in reducing free flow speed on a freeway, narrower lanes or a narrower right side shoulder? Does this make sense to you? Why?
A wire with a linear mass density of 1.08 g/cm moves at a constant speed on...
A wire with a linear mass density of 1.08 g/cm moves at a constant speed on a horizontal surface and the coefficient of kinetic friction between the wire and the surface is 0.250. If the wire carries a current of 1.31 A westward and moves horizontally to the south, determine the magnitude and direction of the smallest magnetic field that can accomplish this. magnitude ____ T direction ______
A highway department is studying the relationship between traffic flow and speed. The following model has...
A highway department is studying the relationship between traffic flow and speed. The following model has been hypothesized. y=B0+B1x+e where y= traffic flow in vehicles per hour x= Vehicle speed in miles per hours    The following data were collected during rush hour for six highways leading out of the city. Traffic Flow () Vehicle Speed () 1255 35 1207 30 1365 50 1314 50 1247 35 1290 45 a. Develop an estimated regression equation for the data. The regression...
A highway department is studying the relationship between traffic flow and speed. The following model has...
A highway department is studying the relationship between traffic flow and speed. The following model has been hypothesized. y=b0+b1X+E where y= traffic flow of vehicles per hour X= vehicle speed in miles per hour The following data were collected during rush hour for six highways leading out of the city. Traffic flow(y) vehicle speed(X) 1169 30 1134 40 1162 30 1223 35 1166 25 1285 40 a) the following Regression equation y=___________+__________x (2 decimals) b) use a=0.05 significance s=________________ (4...
A highway department is studying the relationship between traffic flow and speed. The following model has...
A highway department is studying the relationship between traffic flow and speed. The following model has been hypothesized: y = β0 + β1x + ε where y = traffic flow in vehicles per hour x = vehicle speed in miles per hour. The following data were collected during rush hour for six highways leading out of the city. Traffic Flow (y) Vehicle Speed (x) 1,258 35 1,331 40 1,226 30 1,336 45 1,350 50 1,125 25 In working further with...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT