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At the edges of your vision the eye is much more sensitive to motion
... flicker can be sensed in peripheral vision at higher frequencies than in foveal vision.
The ones installed here ( 5 years or so now and still around 90% still surviving, they are really tough units) only show flicker when passing them with the car, though I can sense the flicker from straight ahead as well, but it is most pronounced from the corner of your eye.
Q2: What non-linearity makes the pulsing worthwhile?
BBC reported that the devices, which flash almost imperceptibly at 100 times a second