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pdlouche
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Not quite as scary as it seems at first glance. If you're on a collision course with something 5 meters away from you, you're going to be taking some sort of evasive action whether you can accurately judge its speed or not. I think the real danger in urban environments is people "looking but not seeing" where they turn their head and saccade over big chunks of their view without realising. I believe that has more to do with the speed they turn their head than anything else.
jimmy_james
In fairness this was a slightly Fisherprice statement made to keep a long post short. It is really about the different ways our eyes and brains create images in various situations.
That Fighter Pilot’s Guide to Surviving on the Roads gives a better explanation, and this post + comment on reddit explains the idea of how that number is arrived at.