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Unsymmetrical vertical curve is occasionally required in geometric design of highways, particularly at interchanges; usual procedure in such cases makes use of two parabolas with vertical axes and common tangent; this results in abrupt change in curvature, and acceleration, at this point of compound curvature; method is suggested using one parabola with its axis inclined; elevations as function of stationing are computed in nondimensional form in terms of three parameters -- two grades and ratio between horizontal projections of tangent lengths.
Unsymmetrical vertical curve is occasionally required in geometric design of highways, particularly at interchanges; usual procedure in such cases makes use of two parabolas with vertical axes and common tangent; this results in abrupt change in curvature, and acceleration, at this point of compound curvature; method is suggested using one parabola with its axis inclined; elevations as function of stationing are computed in nondimensional form in terms of three parameters -- two grades and ratio between horizontal projections of tangent lengths.
Unsymmetrical vertical parabola
ASCE -- Proc (J Surveying Mapping Div)
Vreeland, R.P. (author)
1968
5 pages
Article (Journal)
English
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