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I'm analyzing roads layer to create navigation layer. Each vector Linestring segment has direction of traffic.

Turn defined as where 2 directional segments meet.

However, I find it challenging to associate with turns what we know as "left/right" turn association.

Playing with headings (In both notations: [0,360], [-180,180]) - it's hard to find a formula. Example for the [0,360] notation:

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However, I assume there is a known solution for that, since it's so common task (although I didn't find related questions here).

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