I think its avoir, or like it,
We did the full length of France a few weeks ago to get to Barcelona for the Moto GP
My mate pulled alongside me on most of the toll things, and then we pulled away together so we only paid for one bike each stretch.Paiage.
Saved about £50 on tolls.
No problems with plod,,even made contact with them at the services, go and ask them the way to a place,,freinds for life then,,