The proposed two-lane highway (11-ft lanes) between US-460 and Merrimac Rd, is being designed for 45 mi/h. The maximum superelevation for all curves is planned to be 10 ft/ft. The curve under consideration has its Pl at station 250 + 50 with a central angle of 27 degrees. The terrain rises six feet above the centerline of the proposed highway on the inside of the curve. How far from the radius of the centerline (the middle ordinate) does the construction company need to clear the land to provide adequate stopping sight distance for the design curve? Because clearing earth can be expensive, you want to calculate the minimum value for the design conditions. Your answer should include the length of the curve as well as the middle ordinate to the highway centerline, which is the reference used in laying out construction.
The proposed two-lane highway (11-ft lanes) between US-460 and Merrimac Rd, is being designed for 45 mi/h. The maximum superelevation for all curves is planned to be 10 ft/ft. The curve under consideration has its Pl at station 250 + 50 with a central angle of 27 degrees. The terrain rises six feet above the centerline of the proposed highway on the inside of the curve. How far from the radius of the centerline (the middle ordinate) does the construction company need to clear the land to provide adequate stopping sight distance for the design curve? Because clearing earth can be expensive, you want to calculate the minimum value for the design conditions. Your answer should include the length of the curve as well as the middle ordinate to the highway centerline, which is the reference used in laying out construction.
Chapter2: Loads On Structures
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Transcribed Image Text:The proposed two-lane highway (11-ft lanes) between US-460 and Merrimac Rd, is being designed for 45 mi/h. The maximum superelevation for all
curves is planned to be 10 ft/ft. The curve under consideration has its Pl at station 250 + 50 with a central angle of 27 degrees. The terrain rises six
feet above the centerline of the proposed highway on the inside of the curve. How far from the radius of the centerline (the middle ordinate) does the
construction company need to clear the land to provide adequate stopping sight distance for the design curve? Because clearing earth can be
expensive, you want to calculate the minimum value for the design conditions. Your answer should include the length of the curve as well as the middle
ordinate to the highway centerline, which is the reference used in laying out construction.
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