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* A gas station on A7, south of Lyon, on the level of a town called Vernaison, is a perfect place. To get there, you should take a train heading to Vernaison at garre du gare de Perrache (3euro). At Vernaison you cross the river (there are two bridges and an island betwen). Once on the other site of the river, Turn left (north)and walk for a few kilometers (I walked the no-ones land between the motorway and some firm's fenced property, but there may be a way behind the property). The distance from Vernaison train station to the gas station is not the shortest one, but once you are there, you ar really inside the motorway network, so it's worth the effort.