Game theory predicts the “race to biggest” vehicles. The only way to stop it is through regulation and disincentives.<p>However, it’s important to consider future trends in automotive technology. Eventually, every new car sold will be an EV - so the pollution issue becomes much less of a concern, with a few pedantic caveats. Cars will also become self-driving.<p>Solve for the equilibrium. People will want rooms on the road - a self-driving, self-charging boat of a car that you can sleep in while it takes you from LA to Lake Tahoe overnight. It’ll even reach into the drive-thru window at McDonald’s and put your breakfast on a table for you to eat while facing your family members on a comfy sofa. Cars will become like miniature, smart, electric RVs minus the bathroom and ugly clunkiness. And since people won’t be driving them, and theoretically they can achieve super-human reaction time and sensing, maybe pedestrian safety will become less of an issue.<p>So regulation is tricky. I do think there should be an extra tax to price in the negative externality of large vehicles, but the government shouldn’t go too far with that and it shouldn’t preempt innovation in vehicle format.