I'm a UK resident who travels fairly frequently by car through France. I've been on the Sanef website and from what I can work out, unless I have a French bank account - which I don't - I will need to stop in person at one of the Sanef offices near the Autoroute, provide ID and proof of address and pay for the Telepeage black box using a UK credit card. The Sanef site doesn't give a precise location for their offices: the application form which you can download gives an approximate location. The two offices which would suit me are either Fresnes or Hordain. Are they right on the autoroute at a service station or are they signposted off the autoroute? Any help gratefully received.