Yeah sequential indicators are legal but the whole tail/head light has to light up first then it can do the animation. Or at least that is what I am lead to believe based on some light searching.That's what I was guessing they were, but my quick google search didn't find it. People put sequential indicators on, but yeah, they are NOT legal (as far as I know).
EDIT: They may be legal, with some limitations...
edit for link: https://www.topspeed.com/cars/car-n...round-the-u-s-ban-on-sequential-turn-signals/
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