The transpondeurs in france are free! They are pay as you go and you can choose 1.50 per month 'rental' plus your road use or 2 in the month that you use it plus road charges....
It seems to me that chasing up clients after the event will cost them a lot more. You could legally argue that you should not be liable for any penalties because its the hire car company that are responsible for the payment on time!
Anyway, hope the birds were good and you managed to pick up some goodies....
The whole problem with the tolls is due to cost cutting by not installing pay barriers. To me this is the only way to make things easy - the remainder of the motorways in Portugal have this method (take ticket on the way on and pay in a slot machine or to a real person on the way off). That way, the rather mundane activity of motorway use can be paid and finished with as you leave - all done and sorted.
I refuse to use the transponders for various reasons - I pay my tolls in the Post Offices or in Pay-shops (absurd really but not too painful). All you need to have with you is the number plate.
A client of mine very recently told me that Europcar told him to ignore toll payment - I know that there are a very large amount of unpaid fees. I have no problem with this as things have to change and I think they will have to.
It was obviously a very poorly though out decision to even apply tolls to the A22 Algarve motorway and even more ridiculous to implement the complex paying system. However, its not as bad as many imagine and everybody I have met with a hire car on holiday has not been particularly bothered. It's normal not to pay the toll when you leave the car at the airport (you cannot anyway) at the end of your holiday. Of course the folks that have come out with me don't have to even think about the tolls!
The alternative road - the N125, can be congested at times (like in the old days before the motorway was built) but it is fine for shorter journeys like 20-30kms or so and in the far west, where there is much less traffic. It shouldn't be too bad most of the time except in July and August.
I personally believe that people shouldn't decide for or against visiting the Algarve on the basis of the new motorway tolls (which are not so expensive) -
The people of the Algarve do not deserve to penalised - they work hard to please visitors at many levels - are charming and polite, make excellent eating places and keep their towns, villages and natural areas, including beaches impeccably clean. The motorway tolls are just a minor irritation and not worth fussing about - although I hope the paying system will change soon.
Simon