Well, if the negative externalities of gasoline / diesel were priced in correctly, then individuals would see the tradeoff between large / small and hybrid / IC

Well, if the negative externalities of gasoline / diesel were priced in correctly, then individuals would see the tradeoff between large / small and hybrid / ICE / EV cars, and say "yeah it'd be nice to save some of those expensive petrol if my city could unfuck its traffic." Or improve public transit