Hello,
We have used toll roads in Portugal and found them very easy and reasonable in cost. It was easy to sign up to with a credit/debit card and there are signs at each section of the motorway identifying the charge for that section.
Visit
http://www.portugaltolls.com/en/web/portal-de-portagens/home for information.
Click on the EASYTOLL button (Extract from the website below)
"The EASYToll system is a new solution for automatic payment of electronic tolls, for tourists and immigrants, with the association of a credit card (Mastercard and Visa) to the license plate of the vehicle. The driver, not having to leave the vehicle, enters the credit card in the payment terminal and the system automatically associates the vehicle's license plate to the bankcard. The tolls rates owed are directly debited to the account associated with the card.
At the time of sign up, valid for 30 days, a ticket is issued as proof and must be kept.
The driver is always able to correct license plates numbers or cancel the membership, through the Call Center:
707 500 501 (if in Portugal) or
00 351 287 95 55 (from abroad) or
EasyToll Services.
The sign up has a cost of 0.60€+VAT and each journey has an administrative cost of 0.26€+VAT.
Sign up at the Welcome Points located at the border posts at the following locations:
A28 - Viana do Castelo; A24 - Chaves; A25 – Vilar Formoso; A22 – Vila Real de Santo António"