 Arbitration had been provided by President François Mitterrand.The autoroute aims to shorten the journey from Nantes to Bordeaux which currently uses the A83/A10, this adds 25km to the journey (Sainte-Hermine à Saintes RN137 & A837 autoroute).The A831, will connect Rochefort (A837) with Fontenay-le-Comte (A83).