How much above the speed limit will ISAs let you go? How will ISA enabled cars deal with non-ISA enabled cars? E.g., it isn't uncommon to see 80 in a 60 on one

How much above the speed limit will ISAs let you go? How will ISA enabled cars deal with non-ISA enabled cars? E.g., it isn't uncommon to see 80 in a 60 on one of the highways near me (which is WAY higher than people used drive pre-pandemic). ISA-enabled cars then present an additional danger to the flow of traffic, acknowledging that driving 80 in a 60 is also dangerous and legally, reckless driving. Things external to the car, like road medians, are there for "everyone". Doesn't matter if you have a Delorian, where the speedometers are universally always "0" regardless of speed or a fancy Ford Malibu from 2024.