> Consumers shouldn't pay anything at all for roads.

If consumers get value from roads they should pay. Consumer road damage is certainly measurable, since plenty of roads disallow heavy trucks.

It’s silly to claim because one can see a billboard that the billboard would subsidize the value a consumer derives from roads. Putting up a billboard didn’t cause consumer utility of having a road to become zero. And private property owners are generally free to put up plenty of things, billboards included, without this odd request they subsidize others that look onto their property.