It being "outside our powers of detection" is pretty easily falsifiable too: Just reference a "fixed point" in the other lane (I tend to pick a large truck that

It being "outside our powers of detection" is pretty easily falsifiable too: Just reference a "fixed point" in the other lane (I tend to pick a large truck that's unlikely to lane change, easy to spot at a distance, and driving even more conservatively than I am.) I tend to drive conservatively. Not out of anxiety, but out of "logical caution" and being in no hurry. Like your family member, though, I frequently stick to a lane. When I think another lane is going faster than mine, that truck tends to disappear into the distance in front of me. If anything, I underestimate how much faster, frequently wondering if I won't catch up and spot it again as the lanes take turns alternating between fast and slow over the short term.