Naively that's going to end up disproportionately penalizing EVs[1], which sounds exactly backwards to me. "Weight" is not the correct factor to optimize, basically.
[1] Which are heavy, because they can't source 2/3 of their reaction mass from the atmosphere and have to keep all the reactants in the battery at all time.
Alright? It's not clear by implication what you actually do want to optimize for but the weight/particulate problem is a fairly well-known problem. For instance, from the California Air Resources Board: https://ww2.arb.ca.gov/resources/documents/brake-tire-wear-e...
Weight should certainly be part of the calculation. Road wear, momentum at speed, and particulate emissions (including from tires) all increase with weight.
Fuel consumption? Net total particulate emissions? Net involved fatalities (regardless of fault)? It's not like this is hard. Those are the things people care about reducing.
At best, vehicle mass is a proxy measurement for those things. But the thing is, you use a proxy measurement when the things you're trying to measure are hard to measure. That stuff is easy!
Fundamentally my point is libertarian: If we want to regulate safety, we should regulate safety and not play dumb games with weight rules that then need to be tuned for EVs or whatnot. Fine-tuned rulemaking doesn't work.
[1] Which are heavy, because they can't source 2/3 of their reaction mass from the atmosphere and have to keep all the reactants in the battery at all time.