CE 463 HOMEWORK 3 .edu
CE 463 HOMEWORK 3
Assigned on 9/15/2008
Due on 9/24/2008
Problem 3.1 (15 points) Consider a WB-50 design vehicle. On a curve with a radius of 1000 ft, a width of traveled way on the tangent of 22 ft, and a posted speed limit of 55 mph, does the pavement need to be widened? If it does need to be widened, where would you advise adding the additional pavement? Be sure to show your work. Use the attached figures to determine the input values and include them with your mark-ups with your homework submission.
Problem 3.2 (5 points) A curve is being designed for 70 mph. What is the minimum curve radius when the maximum rate of superelevation is 6% and the maximum side friction factor is 10%. Be sure to show your calculations.
Problem 3.3 (10 points) A 3% uphill grade is immediately followed by a 2% downhill grade along a proposed highway alignment. For a design speed of 55 mph, find the minimum length of a vertical curve that satisfies the passing sight distance requirement. Use equations and show all calculations. Based on the result, would you restrict the passing maneuver and redesign the curve appropriately?
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[1] American Association of State Highway and Transportation Officials (AASHTO). (2004). A Policy on Geometric Design of Highways and Streets, Fifth Edition. Washington, D.C., p.206.
[2] American Association of State Highway and Transportation Officials (AASHTO). (2004). A Policy on Geometric Design of Highways and Streets, Fifth Edition. Washington, D.C., p.204.
[3] American Association of State Highway and Transportation Officials (AASHTO). (2004). A Policy on Geometric Design of Highways and Streets, Fifth Edition. Washington, D.C., p.207.
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