But would you really want to change all the roads with problems rather than circumventing the problem alltogether?
Yes.
I like the contrast of winding roads where they are made by people who don't have much of a technical means to make them straighter contrasting with straight, mostly even roads full of tunnels, high bridges and cutting through hills made by an advanced "Roman" civilisation existing side by side. I like how old roads can get forgotten and fall apart where old trade routes aren't profitable anymore, due to a multitude of factors. I like when I see new roads using parts of old in their construction, maybe even retaining some of the different building style. This can tell a lot about who lives in the area as well as its history. It tells a lot about what used to be important routes across the land, and can tie in nicely with the big stories of fallen empires, cataclysms, wars and famines as well as the raise of new powers.
From the state of a road, from where it leads from and to where it goes, from the changes along its course, from how it deals with the natural terrain - if it subjugates it or works around natural obstacles - you can read a lot of information.
This, however, requires a lot of thought. It also requires a varied terrain with lots of cliffs and hard to navigate terrain. A road along some gentle hills will have some curvature here and there, but it will mostly look the same no matter who made it, and which tools where used to make it. A road through steep hills and mountains? Exploring it is an adventure for anyone with a keen eye and a sense for details.