Well yes, but that's not quite the point: some externalities that might be priced into cars (or anything) might actually exist anyway. The truck thing is easy:

Well yes, but that's not quite the point: some externalities that might be priced into cars (or anything) might actually exist anyway. The truck thing is easy: treat them as commercial vehicles and see if people still think they're cool with a speed limiter, tachograph, mandatory maximum driving times and a more rigorous driving test[1]! And, yes, I do know about that thing with the seats in Ford vans, but there might be a billion in fines for that. [1] Which begs the question: would doing that for all vehicles reduce externalities with less usage, lower speeds and safer driving?