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Another, a bit more expensive but possibly faster, is to take a train directly to [[Orleans]] from Paris-Austerlitz station. The ticket will cost you about 18 €. North of the center passes an expressway which joins the A10 and has a Péage just before the junction. You'll need a sign saying [[Tours]] (if you go direction Tours>Bordeaux or Vierzon if you need to take the A20 towards Toulouse).
===A11 South-west to [[Le Mans]], [[Nantes]], [[Brittany]]===
This highway splits from the A10 near Dourdan. There are several possibilities go get on this road: 1) The gas station at Briis-sous-Forges. Look at A10 section
2) Take a train to Rambouillet from Paris-Montparnasse (about 7€) and start hitching on the N10 south, until the A11 entrance