Paved roads are not common in Andean countries, the construction and costs are a complicated and expensive task.
Many governments, federal, state or municipal just do a little maintenance but safe driving is not always ensured.
One extreme example is this mountain road stretch in Bolivia. The details are horrendous but the truckers manage it. Most of them arrive, safe and well, thanks to their special skills.
Probably the best truck drivers in the world.
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