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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 1 year ago
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