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With this guy's thing you can set 0 (off), 3, 4, or 5 flashes, and it'll have cancelling.
Personally, I find 3 flashes is the perfect length to pace your lane change to be smooth but not annoyingly slow.
I never trust anyone else or assume anyone else is paying attention on the road, but that's a whole different story. The only time this should be an issue is on a 3+ lane road.
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