Superelevation Criteria for Sharp Horizontal Curves on Steep Grades (2014) / Chapter Skim
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7 S E C T I O N 1 1.1 Background Geometric design policy for horizontal curves is set by the American Association of State Highway and Transportation Officials (AASHTO) in A Policy on Geometric Design of Highways and Streets, commonly known as the Green Book, and by the design manuals of individual highway agencies.
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From page 8... ...
8The approach suggested in the Green Book of adjusting the design speed to determine the appropriate superelevation for curves located on steep grades is a suitable approach given the current state of research knowledge. Additional knowledge is needed, however, to make such guidance more quantitative for specific combinations of curvature and grade.
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From page 9... ...
9 on a horizontal curve, also referred to as the coefficient of friction. The maximum side friction supply is utilized when a vehicle is at the point of impending skid.
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