Given a design speed of 70 km/h, a horizontal curve radius of 550 m, a road platform width of 10 meters, and an initial slope of 1% for a two-lane highway, superelevation is applied by rotating the road about its inner line (maintaining constant elevations along the inner line). Deflection angle and the stationing of point of intersection: A= 30°, stnPI = 12 + 25.00 a) Calculate the required superelevation rate. b) Determine the superelevation application length. c) Illustrate the cross-section of the roadway at each 1% change in superelevation, including all necessary information on the drawings.
Given a design speed of 70 km/h, a horizontal curve radius of 550 m, a road platform width of 10 meters, and an initial slope of 1% for a two-lane highway, superelevation is applied by rotating the road about its inner line (maintaining constant elevations along the inner line). Deflection angle and the stationing of point of intersection: A= 30°, stnPI = 12 + 25.00 a) Calculate the required superelevation rate. b) Determine the superelevation application length. c) Illustrate the cross-section of the roadway at each 1% change in superelevation, including all necessary information on the drawings.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Highway Engineering vertical curve problem
![Given a design speed of 70 km/h, a horizontal curve radius of 550 m, a road platform width
of 10 meters, and an initial slope of 1% for a two-lane highway, superelevation is applied by
rotating the road about its inner line (maintaining constant elevations along the inner line).
Deflection angle and the stationing of point of intersection: A= 30°, stnPI = 12 + 25.00
a) Calculate the required superelevation rate.
b) Determine the superelevation application length.
c) Illustrate the cross-section of the roadway at each 1% change in superelevation, including
all necessary information on the drawings.
d) Create a plan and profile of the superelevation application, show relevant information on
these drawings.
e) Draw the horizontal curve. (A= 30°, stnPI = 12 + 25.00)
f) Determine the set-back distance for placing a large billboard without compromising the
required SSD (Sight Stopping Distance) and show a suitable location for the billboard on
the figure. [t, = 2.5 s, road grade = -4% (downhill), f=0.15]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F72b8ce88-847f-4f53-aad5-cdd82e3adb7c%2Faaa7f1c9-4074-4df4-a6fc-6492ad9d1cdd%2F2ouju8t_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Given a design speed of 70 km/h, a horizontal curve radius of 550 m, a road platform width
of 10 meters, and an initial slope of 1% for a two-lane highway, superelevation is applied by
rotating the road about its inner line (maintaining constant elevations along the inner line).
Deflection angle and the stationing of point of intersection: A= 30°, stnPI = 12 + 25.00
a) Calculate the required superelevation rate.
b) Determine the superelevation application length.
c) Illustrate the cross-section of the roadway at each 1% change in superelevation, including
all necessary information on the drawings.
d) Create a plan and profile of the superelevation application, show relevant information on
these drawings.
e) Draw the horizontal curve. (A= 30°, stnPI = 12 + 25.00)
f) Determine the set-back distance for placing a large billboard without compromising the
required SSD (Sight Stopping Distance) and show a suitable location for the billboard on
the figure. [t, = 2.5 s, road grade = -4% (downhill), f=0.15]
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