Earlier quoted context omitted.
Radar etc. almost certainly make it easier, but for it to be "never" this would also have to be provably impossible for humans. Which isn't too say it's not never, as I remember studies in my own childhood that said human drivers were also bad at recognising how far away children were, and I've never heard of human perception of skin colour being tested in this way so it might just turn out that melanin is unfortunat…
I'm confident that a comprehensive study would show that on average humans are worse at detecting people of color against dark backgrounds (if we agree this is code for "people with highly pigmented skin" and not Asians or Latinos). There is just much less contrast to work with, and dark skin also makes facial features stand out less (which is an issue because faces are the thing humans can recognize best). There is…
As another bonus, it also provides an extra excuse to advocate against replacing humans with AIs.