Of course I don’t mean that literally not a single small car is for sale. 🙄 Anyone who has done even the most cursory search knows that the market for small cars is extremely different in other parts of the world. When you’re misinterpreting my comments in such an uncharitable way, I don’t really see a point in continuing this discussion.

You want to reduce the size and impact of vehicles on roads you don’t do it by doubling the cost of all vehicles, period.

When did I ever say we should “double the cost of all vehicles”? What an insane way to argue with someone! You can’t just invent stupid positions and attribute them to your interlocutor.

I agree with your proposal. A road tax based on weight internalizes the externalities. It sounds like you think we disagree because you don’t know what an economic externality is. Instead of your glib reply, you could… look it up before replying.