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I have an opinion, and we all know what that's worth!
It also depends on the screen. Some are much less restrictive than others.
But it's sort of an educated guess, and of course there is no "open/closed" behavior to this- it gradually goes from acting unrestricted to acting very restricted. To assign a speed value to when it acts "closed", then, we must decide when the most noticeable change of behavior is noted.
So, I really shouldn't even put a number out there, but for the off-road vehicles I used to design, I figured this occurred around 40 mph.
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