Hi Peer, unfortunately the curve solvers available to me do not support curves with a tangent discontinuity internal to a span.

So I don't think I've got anything that could help with that.

Maybe some strategies here:
https://math.stackexchange.com/questions/1140778/b%C3%A9zier-curve-higher-order-detect-sharpness-serpentine-or-cusp-in-curve

- Michael