Any change's effect is relative. If new cars become more expensive because of regulation then used cars become slightly more expensive because the market as a w

Any change's effect is relative. If new cars become more expensive because of regulation then used cars become slightly more expensive because the market as a whole shifts. So the poor end up driving just as unsafe a vehicle but pay a bit more. Of course the poor, like everyone else, in theory benefits from the positive externality of other people having backup cameras and other safety features.