Warning Road Signs (Argentina)
Signs on Route 40 on the way to Abra El Acay (Acay Pass, 4,895m).
Despite all the signs and local people telling me that it was a very difficult road, I had no problem at all with my rented Volkswagen Gol, but the season was exceptionally dry this year and the river level was lower than usual.
You can attempt to cross this pass with a pasenger car only if the weather is very dry (no rain in the past several days) and if there is no chance of storm. If you get stuck or break down, it might take days to get you (and the car) back to civilization! So be prepared for the worst case.