Inca Road Network Expansion in the 1460s

Timeline

1. 1461–1465Cusco–Lake Titicaca route · CollasuyuIn the early 1460s the empire extended roads south toward Lake Titicaca and Bolivia, using stone-paved roadbeds and terraced embankments to suit high-altitude terrain, greatly shortening march and tribute transport times between the newly annexed Colla region and the capital.
2. 1465–1469Eastern Andean slope to north coast connecting road · North CoastTo support the expedition against Chimú, construction intensified in the mid-to-late 1460s on connecting roads from the eastern Andean slopes to the north coast, including rope bridges and stone stairways, allowing troops and supplies to cross the eastern Andes rapidly to the Moche Valley.
3. 1466–1470Network of tambos (relay stations) along the Andes · PeruBy the late 1460s the empire added tambo storehouse-relay stations along newly extended routes, staffed by chasqui messengers relaying intelligence and tribute lists, forming an efficient communications and logistics system spanning thousands of kilometers and serving as a technical pillar of imperial rule.