> If they are mostly unenforced, how does the system work? Does everyone implicitly add 20% to the posted limit, or do they just go whatever speed feels right t

> If they are mostly unenforced, how does the system work? Does everyone implicitly add 20% to the posted limit, or do they just go whatever speed feels right to them given the road and the conditions? Usually people go limit + 10mph on major freeways, and "whatever feels safe" in city driving.