It is one of the few routes that connects the Amazon rainforest region of northern Bolivia, or Yungas, to its capital city. Upon leaving La Paz, the road first ascends to around 4,650 metres (15,260 ft) at La Cumbre Pass, before descending to 1,200 metres (3,900 ft) at the town of Coroico, transiting quickly from cool Altiplano terrain to rainforest as it winds through very steep hillsides and atop cliffs.
Because of the extreme dropoffs of at least 600 meters (1,830 feet), single-lane width – most of the road no wider than 3.2 metres (10 ft) and lack of guard rails, the road is extremely dangerous. Further still, rain, fog and dust can reduce visibility. In many places the road surface is muddy, and can loosen rocks from the road.
One of the local road rules specifies that the downhill driver never has the right of way and must move to the outer edge of the road. This forces fast vehicles to stop so that passing can be negotiated safely. Also, vehicles drive on the left, as opposed to the right like the rest of Bolivia. This gives a left hand drive vehicle's driver a better view over his outside wheel, making passing safer.
On 24 July 1983, a bus veered off the Yungas Road and into a canyon, killing more than 100 passengers in what is said to be Bolivia's worst road accident. --Wiki
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