Increases to tariffs are about 1.8% from today. Since privatisation some 12 years ago prices have steadily increased thanks to "greater investment" according to the operators. Previously mainly built under a PFI (private finance initiative) with routes reverting to the state after 25/30 years, privatisation was seen as a way to relieve the state of any costs.
The report on France Info gives the example of 20 centimes increase on the Toulouse/Cahors journey, presumably on the two autoroutes combined.
Frequent users with a telepass contract may see their bills reduced by up to 30%.