Safe/unsafe aren't binary in this case. It doesn't flip from 0 to 1 just because he drove an extra 20 minutes. The "unsafety" of driving was non-zero all along

Safe/unsafe aren't binary in this case. It doesn't flip from 0 to 1 just because he drove an extra 20 minutes. The "unsafety" of driving was non-zero all along, and the longer he goes without a rest break make it climb ever so higher. Saying that this factor was safe when it was 0.9000 but as soon as it rolled over to 0.9001 it was unsafe is asinine. Likely, enforcing such a rest stop could make it more unsafe... if after the rest he was in a hurry to head home, or groggy from an impromptu nap, or even if driving or lighting conditions had changed. > If he wants to get home, he can move closer or find another route. Neither of these are practical, in the "completely unachievable in the real world by real people" meaning of the word.