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- W597574962 abstract "In horizontal curve design, superelevation plays the role of supplementing side friction in order to provide adequate sideways force. Despite being a physical element of geometric design, superelevation has been empirically found to have no significant effect in determining vehicle speed on curves. In contrast, horizontal curve radius is consistently shown to be correlated to 85th percentile speed values measured. Nevertheless, in most geometric design guidelines, which have traditionally been based on the design speed concept, it is implied that, within defined limits, any combination of curve radius and superelevation is acceptable. Usage of a high permissible radius with a low assumed design speed can induce excessive speeds and thus be detrimental to safety. Introduction of the 85th percentile speed as a design parameter in some design standards has provided a useful check on the suitability of design speed. However, the absence in large federal countries (such as the United States and Australia) of a unique nationwide maximum superelevation rate leads to cases where identically-designed curves correspond to different assumed speeds. Proposals for simplifying the relationship between curve radius and superelevation rate are presented in this paper, as potential means for addressing the above issues. The advantages of a simplified approach from both the designer's and road user's viewpoints are identified; potential theoretical and practical drawbacks are also discussed." @default.
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- W597574962 date "2000-06-01" @default.
- W597574962 modified "2023-09-27" @default.
- W597574962 title "INTRODUCING A SIMPLIFIED APPROACH TO HORIZONTAL CURVE SUPERELEVATION DESIGN - A DISCUSSION OF POTENTIAL ADVANTAGES AND DRAWBACKS" @default.
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