Definition of reverse curve
: an S-shaped curve (as in a railway line or a highway) made by joining two simple curves turning in opposite directions
broadly
: a stretch formed of two oppositely turning simple curves joined by a tangent
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“Reverse curve.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/reverse%20curve. Accessed 1 Aug. 2021.
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The first known use of reverse curve was in 1821
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