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From the old center, take the east and follow the Loire River, then, you will see the first place, just between the Loire and the Tours Castle, it's a very long bus stop, if you're alone and you're smiling, it will be OK... But if it's don't working, you can walk 2 kilometers always by follow the river, there is some places...

==== Join the gas station "Total - Relais Sainte-Maure" ====

To reach the [https://www.openstreetmap.org/way/433456162#map=17/47.16720/0.63017 gas station "Total - Relais Sainte-Maure"] which is the first on the A10 southbound.