....if you intend to use the A13 motorway on your journey to Brittany you will need to pay the tolls online or certain other pay points or have a French liber-T tag on your towcar.
There are no toll booths at which to make a payment on the motorway.
Worth looking into as the French are phasing out toll booths.
See this article. The way I read it, is you can drive through then pay your bill within 72 hours.
I took the A16 and A 29 last year, still booths.
But as it is being phased in there will be differences. Best to check with each motorway operator before travel.
Note this!
Note: contactless smartphone payment is illegal!
In January 2025, a French motorist was fined 135€ for using Apple Pay on his smartphone to pay motorway a toll. Vinci, the operator of the motorway, had encouraged smartphone payment, but technically, it's illegal: drivers can't use their phones for any purpose while on a highway!
President Macron has called for a change in the law to allow contactless smartphone payment, but until this makes its way through French bureaucracy, it's best to pay by contactless credit or debit card.
Even the operators don’t know what they are doing.
Re the OP’s question. Long drive, but doable. All decent roads.
John