At least 200 vehicles were stranded as a result of the blockade, causing huge traffic jam in the morning, Arequipa's highway protection chief Miguel Pasos said.
Police efforts were not enough to restore the traffic on the highway that connects Arequipa to Lima, he added.
The Pan-American Highway is a network of roads stretching about 48,000 km and links the mainland countries of the Americas in a connected highway system.
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See also Sydney Irresistible and for personal comment, Mike Hitchen Unleashed
Putting principles before profits
See also Sydney Irresistible and for personal comment, Mike Hitchen Unleashed
Putting principles before profits