Sounds like you could star in the next series, there Gary !
Double yikes !!
Its hard to visualise just how scary the (3,000 metres-odd?) drop-offs over the sides of these roads really are .. but as you say, even more scary is what seems to happen when you meet a car (or truck .. or bus) coming in the opposite direction !
Between rockfalls, snowfalls and full-on 'streams' (rivers?), crossing these dirt roads, and local folk ... angry from having to follow slow-movers up the road, it certainly sounds like one of those experiences fully worthy of TV viewing (for wimps like me !)
Sorry for hijacking this thread (a little bit), but the views from the space-station, as spectacular as they may be for astronomers, couldn't really compare to the ground-based experience of peering over the edge and losing one's balance momentarily !
Perhaps a good activity for those young enough to not have fully experienced the sheer terror of realising one's vulnerability on such roads !?!
Cheers