Track transition curve

Rarity: Common

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Notion

Domain

Science and technology

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What Wikipedia says

A transition curve (also, spiral easement or, simply, spiral) is a spiral-shaped length of highway or railroad track that is used between sections having different profiles and radii, such as between straightaways (tangents) and curves, or between two different curves.

Excerpt from the Wikipedia article “Track transition curve”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: InverseHypercube, CC BY 3.0, via Wikimedia Commons.