Question

In: Civil Engineering

Problem Statement:  A four-lane (two-lanes in each direction) freeway is on rolling terrain with 11-ft lanes, a...

Problem Statement:  A four-lane (two-lanes in each direction) freeway is on rolling terrain with 11-ft lanes, a 5-ft lateral clearance on right side and 3-ft lateral clearance on the left side of the traveled pavement. The measured free-flow speed is 60-mph. During the peak hour there are 12% large trucks and buses and 6% recreational vehicles. The freeway currently operates at capacity during the evening peak hour. If an additional 11-ft lane is added, and all other factors stay the same, what will the new level of service be?

1) (3 pts) Describe in 1 to 3 complete sentences:

  • What type of problem is this?
  • Describe what you are being asked to solve for.
  • Draw a diagram of the problem.

2) (3 pts) Describe, in complete sentences, the general method used for solving the type of problem identified in step a.

3) (2 pts) List all know information, translated into the appropriate variables. For example, if the problem specifies, “the initial speed is 70-mph”, you would list this as vi=70 mph.

4) Solve the problem, explaining each step. You should explain what each step is, why you are using a particular equation, any assumptions you are making. You should split your paper in half vertically and use one side to write the solution and the other side for the explanation. An example of what I’m looking for in a setup is below.

5) (2 pts) In 1 to 2 complete sentences, provide an analysis or justification for your solution. Does the answer seem reasonable? Why or why not? Is it the right order of magnitude? Why or why not?

Solutions

Expert Solution

1. This question ask about Level of Service. Currently the freeway is working on its capacity i.e. on LOS E with 4 lane facility. Question have asked that what will be new LOS for freeway when one more lane is added i.e. total number of lanes are 5.

2. The problem is solved using procedure laid by Highway capacity Manual. All the steps are self explainatoryAnswer is coming to be LOS D, which is obvious that 4 lanes are proving LOS E then 5 lanes will better failitate the vehicles to move on. Therefore LOS will be better in case of 5 lanes. LOS D is better than LOS E.

Ally Wells answered 11 months ago
Next > < Previous

Related Solutions

A four-lane urban freeway is rolling on rolling terrain with 12-ft lanes, obstructions 2-ft from the...
A four-lane urban freeway is rolling on rolling terrain with 12-ft lanes, obstructions 2-ft from the right edge of the traveled pavement, and nine ramps within three miles upstream and three miles downstream of the midpoint of the analysis segment. The traffic stream consists primarily of commuters. A directional weekday peak-hour volume of 2400 vehicles is observed with 800 vehicles arriving in the most congested 15-min period. If the traffic stream has 10% large trucks and buses and recreational vehicles,...
A six lane urban freeway (three lanes in each direction) in mountainous terrain has 10-ft lanes...
A six lane urban freeway (three lanes in each direction) in mountainous terrain has 10-ft lanes and obstructions 5 ft from the right edge. For every mile of freeway, there is one interchange. The traffic stream consists of mostly commuters with a peak hour factor of 0.84, peak hour volume of 2500 vehicles, and 4% recreational vehicles. What is the LOS? Assume base free flow speed of 70 mph
An existing rural 4-lane freeway (2 lanes in each direction) has 11-ft lanes and 2-ft lateral...
An existing rural 4-lane freeway (2 lanes in each direction) has 11-ft lanes and 2-ft lateral clearance. The freeway hasa peak-hour volume of 1,800 veh/h in one direction, 5% trucks in the traffic stream, and a PHF of 0.92. The freeway has 1 cloverleaf interchange within three miles of the midpoint of segment, and runs through level terrain. No recent field speed data is available. a) Using HCS7, determine the LOS during the peak hour. b) What is the capacity...
A six-lane freeway with three lanes in each direction is on a level terrain and has...
A six-lane freeway with three lanes in each direction is on a level terrain and has 11-ft lanes with a 4-ft right-side shoulder. The total ramp density is 2 ramps per mile. The directional peak-hour traffic volume is 5400 vehicles with a peak-hour factor of 0.95 and all familiar users. The traffic stream includes 5% trucks and another 5% buses and no recreational vehicles. The city has decided to ban all heavy vehicles from using the freeway during the peak...
[HCM for Basic Freeway Segments] A four-lane freeway (two lanes in each direction) has an observed...
[HCM for Basic Freeway Segments] A four-lane freeway (two lanes in each direction) has an observed demand volume of 2400 veh/h (one direction) during the peak hour. The freeway is on rolling terrain and the traffic stream consists of passenger cars and trucks only. The peak-hour factor is 0.75 and the traffic is all commuters. If the peak 15-min demand flow rate under equivalent base conditions is estimated to be 2000 pc/h/ln, what is the percentage of trucks in this...
A four-lane freeway (two lanes in each direction) operates at capacity during the peak hour. It...
A four-lane freeway (two lanes in each direction) operates at capacity during the peak hour. It has 11-ft lanes, 4-ft shoulders, and there are 3 ramps within 3 miles upstream of the segment midpoint and 4 ramps within 3 miles downstream of the segment midpoint. The freeway is on rolling terrain and has 8% heavy vehicles with a peak-hour factor of 0.85. It is known that 12% of the AADT occurs in the peak hour and that the directional factor...
A four-lane freeway (two lanes in each direction) operates at capacity during the peak hour. It...
A four-lane freeway (two lanes in each direction) operates at capacity during the peak hour. It has 11-ft lanes, 4-ft shoulders, and there are 3 ramps within 3 miles upstream of the segment midpoint and 4 ramps within 3 miles downstream of the segment midpoint. The freeway is on rolling terrain and has 8% heavy vehicles with a peak-hour factor of 0.85. It is know that 12% of the AADT occurs in the peak hour and that the directional factor...
6-lane freeway (3 lanes in each direction) in level terrain has a current one-directional volume of...
6-lane freeway (3 lanes in each direction) in level terrain has a current one-directional volume of 5000 veh/h; it is estimated that in 3 years, volume will have increased to 5600 veh/h. The traffic mix includes 10% trucks. The free-flow speed has been measured at 70 mph and the PHF is 0.95. a) Determine the current LOS. b) Determine the LOS in 3 years. c) After the initial three years, traffic grows at 4% per year, when will capacity be...
An existing four lane section of urban freeway (3 lanes each way) is located in rolling...
An existing four lane section of urban freeway (3 lanes each way) is located in rolling terrain and has 10’ travel lanes, no lateral obstructions within 5’ of the pavement edge. The roadway has 8 ramps upstream and 4 ramps downstream of the midpoint of the six mile analysis segment. The traffic stream contains 10% trucks and buses, and 4% RV’s. The peak hour directional volume is 3200 vehicles with the heaviest 15 minute volume of 800 vehicles. What is...
A six-lane freeway with three lanes in each direction has regular weekday users. The lanes are...
A six-lane freeway with three lanes in each direction has regular weekday users. The lanes are 12 feet wide, the right-side shoulder is 2 ft wide, and there are two ramps within 3 miles upstream and two ramps within 3 miles downstream of the segment midpoint. The highway is on rolling terrain with 12% large trucks and buses and 2% recreational vehicles. The peak hour factor is 0.85. Determine the maximum hourly volumes that can be sustained at LOS C...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT