>Ah, I see!
>
>Well, I've no idea, sorry. Seems unlikely. The main reason why they will never change is the thousands of miles of roads, including motorway, with all the sign-posts. All the cambers and stuff would become adverse or something like that. I'm not sure that motorway interchanges can just be reversed conveniently either.

Well, Sweden did it, didn't it? It took a campaign over several weeks, but they did it.

>For instance, suppose a certain hamlet only has access onto a motorway; if you reversed it the hamlet would only have access from the motorway.

They'd sure get into "you can come in but you can't leave" which is far worse from "you can't come in but you can leave" :).