@aeva circles turn out to be really brutal to humans because the nature of a circular trajectory is constant (usually pretty hefty) acceleration that spikes sharply once you enter the loop
@aeva Roller coasters used to do this, briefly, 100+ years ago, and stopped doing it pretty quickly because it causes whiplash and other injuries.
Now the usual loop shape is "clothoids", which gives a smooth transition between a linear segment and a circular arc, instead of that instant high-gee spike. Turns out to be ergonomically much better that way
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