Editing Inca road system (section)

===Tunnel===
To access the famous Apurímac rope bridge it was necessary for the road to reach the narrowest section of the gorge: to this end, the road was cut along a natural fault into the steep rock of the valley and a tunnel was carved to facilitate the way. The tunnel had a series of side openings allowing the light to come in. There is no evidence of other tunnels along the Inca roads.<ref>Bauer, Brian (----). Suspension Bridges of the Inca Empire" - http://www.academia.edu/6953894/Suspension_Bridges_of_the_Inca_Empire</ref><ref>Squier, Ephrahim George (1877). Peru, incidents of travel and exploration of the land of Incas, New York</ref>