Just be careful how you pay when you're at the tolls...
A few of us went on a tour in France back in May and paid by credit card at the relevant credit card toll booths - but if you go there, they charge you car rates They have no way of knowing you're on a bike at the automatic card machines, so you pay for a car.
The thing to do is go to the cash booth (where you can also pay by card if you are on a bike) and pay the correct rate...
The nice people at Sanef listened to my plea when i got back and refunded me the difference between the car rate I paid and the bike rate I should have paid... but I'm older and wiser...