The Other Wiki calls these motion lines, and mentions that they're "also known as movement lines, action lines, speed lines, or zip ribbons". Adobe uses the name "speedlines".
As far as DuckDuckGo tells me, "Speed Stripes" is a term used only by TV Tropes.
It's part of All The Tropes' mission statement to be a reference for everybody, not a place where made-up terms are used. The term that appears to be in Real Life common use is "speed lines". I propose we use this Real Life term.
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