Abstract
Following the roadside design curve of a spiraled roadside curve (SRC) previously proposed by the authors, this paper examines the characteristics of the required lateral offset ratios defined by the SRC on roadway reverse horizontal curves, including two reverse spiraled horizontal curves with and without an intermediate tangent. The radius ratio of two reverse simply horizontal curves, the spiral curve lengths of two reverse spiraled horizontal curves, and the intermediate tangent length were found to be the major influential factors of the offset ratios. A complete set of design tables was developed for reverse simple horizontal curves and reverse spiraled horizontal curves respectively, which would have significant engineering implications to roadside design of roadway reverse horizontal curves.
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