The car already has a ruleset for when to not obey speed limits. If you're on the highway and your lane is going 65mph but the other lanes are moving very slowl

The car already has a ruleset for when to not obey speed limits. If you're on the highway and your lane is going 65mph but the other lanes are moving very slowly, the car will slow down accordingly. Similarly, this could be implemented for the inverse to an extent. And again, I don't think the car should speed by default, but a car going 2-3mph over the posted limit should be acceptable rather than an error state because the world is not black and white.