Reverse curve

In civil engineering, a reverse curve (or "S" curve) is a section of the horizontal alignment of a highway or railroad route in which a curve to the left or right is followed immediately by a curve in the opposite direction.

On highways in the United States reverse curves are often announced by the posting of a W1-4L sign (left-right reverse curve) or a W1-4R sign (right-left reverse curve), as called for in the Manual on Uniform Traffic Control Devices.

单词	Reverse curve
释义	Reverse curve 原声例句科普小杂文 Although their results seem to take on a sort of reverse J curve - where no exercise is really really bad, moderate exercise is ideal, and too much exercise is bad - but still not as bad as none at all. 儘管他们的研究结果近似于「反J曲线」——也就是：不运动真的非常非常不好，适度运动是理想的，运动过度虽然也不好——但也没有比完全不运动还糟。英语百科 Reverse curve In civil engineering, a reverse curve (or "S" curve) is a section of the horizontal alignment of a highway or railroad route in which a curve to the left or right is followed immediately by a curve in the opposite direction. On highways in the United States reverse curves are often announced by the posting of a W1-4L sign (left-right reverse curve) or a W1-4R sign (right-left reverse curve), as called for in the Manual on Uniform Traffic Control Devices.
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