Seek or Avoid Curves

Rank a mountain trip's routes by how winding they are, set what counts as a curve, see its open-road bends, town turns and hairpins, and pick a curvy stretch to see where it runs.

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Each route comes back with its curves, and getRouteProgressForSection times each one, so ranking the routes by their share of the drive in curves takes one sum.

calculateRoute finds the curves and curvy stretches once sectionTypes names them, with the thresholds in curveDetection.
withCurveSections finds them again when a slider moves, with no new request.
getSectionsWithin finds the turns in towns, the curves in tunnels and the stretches only one route drives. isHairpin keeps the hairpins.
sections.curve: { visible: true } draws each curve in a rose that deepens with its severity.