It would be nice if you could convert any road type to any other road type when you open up a road menu. Even if it is for full price. The reason is that I would like to have all aluminum roads at this point in the game but I have so many roads zig zagging all over the place it would take forever to delete roads by hand and re pave them. Seeing as how you dont really have a choice on which roads you can build early on in the game (due to lack of aluminum until you can increase production much later)