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== Travel times ==
To find the best route, the travel times between all locations are required. While most other route optimization tools use geographic distances (as the crow flies), RouteXL uses open source route planners based on the [https://www.openstreetmap.org/ OpenStreetMap] road network to determine travel. OpenStreetMap is the free Wiki World Map – an openly licensed map of the world being created by volunteers using local knowledge, GPS tracks and donated sources.
== Optimization ==
Mathematicians call it a "hard" problem and there is no final one-size-fits-all solution available. They even have a name for it: ''The Travelling Salesman Problem''. Indeed, humans can fly to the moon, but can't solve this problem.
=== Method ===
