Eleven people were killed and 86 others injured in a one-week period on Bolivia's "highway of death," authorities said Wednesday.
A bus crash Tuesday near the village of Irupana, 151 kilometers (98 miles) from La Paz, left five dead and 45 injured.
The bus ran off the road and plunged 250 meters (820 feet) to the bottom of a ravine.
One person died and four were hurt on Monday when a vehicle flipped over on another stretch of the same narrow, poorly maintained road.
Last Thursday, four people were killed and 37 others injured when a bus fell into a ravine 120 meters (393 feet) deep, while a fifth person died in an accident involving a van.
The "highway of death" winds through Yungas, a region of steep valleys that descend from the 4,000-meter (13,114-feet) Andean highlands into Amazonian jungles.
The road's dangers - and its spectacular views - have become an attraction for daredevil cyclists and bikers, mostly from abroad.