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It doesn't seem to have much effect in the video. I think things like this are confusing to the brain and would distract the driver from what's going on. So could be more hazardous in reality. I always slow down at a zebra anyway.
They should be in my road, but as speed bumps, local neighbours don't speed but it would make the rat race people think a bit. Our road is a race track at certain times of the day.