ON ELECTRONIC ONLY MOTORWAYS (electronic detection of plate number):
The Algarve's main motorway, the A22 and some Portuguese motorways with electronic payment, operate an unmanned toll system. A toll transponder device is available upon collection for an additional charge of 20 EUR, payable locally. This includes 15 EUR worth of pre-loaded credit and enables clients to use the toll road without having to visit local pay stations/post offices. An option to add more credit to the transponder is available upon collection or during the rental. Any remaining credit on the transponder cannot be refunded, even if the toll road is not used.
Clients wishing not to use the toll road must mention upon delivery of the vehicle and will be required to leave a deposit of 20 EUR. This amount will be refunded in full between 48 hours and 5 days of the rental ending, providing the toll road was not used (only possible to verify 48 hours after rental has finished).
If in the end of the rental period (48 hours after) the full credit is consumed and the balance is verified negative, if Client doesn't offer to pay the amount to cover the balance, the Car Rental Company will be obliged to identify the driver. Then the driver will be contacted by post as usual happens with traffic fines. Alternatively and to avoid these contacts there is the possibility of paying on any Post Office or Pay-Shop giving the vehicle plate number. Info only live after 48 hours of passing and during 5 days.
Note: this brings and issue for the last 2 days where payment is impossible. Later you'll receive a letter written in Portuguese with Portuguese E-Banking code to provide payment. Impossible from abroad! So we strongly recommend to always leave minimum credit on the transponder.
ON NORMAL MOTORWAYS (swipe card and toll attendant):
a) Entering pass only on the line where you see:
Credit Card and Coins 
Tolls AttendantNote: do not pass on the "Via Verde" line 
This is reserved for vehicles with Electronic Device Equipment! You'll be fined if pass here!
This is reserved for vehicles with Electronic Device Equipment! You'll be fined if pass here!b) Press on the button to remove a tolls ticket to present when exiting. Keep this ticket till the end.
c) Exiting pass only on the lines where you see:
Credit Card and Coins Tolls AttendantNote: do not pass on the "Via Verde" line This is reserved for vehicles with Electronic Device Equipment! You'll be fined if pass here!
This is reserved for vehicles with Electronic Device Equipment! You'll be fined if pass here!d) Swipe the tolls ticket and pay with Credit Card or give it to the Attendant and pay with Cash or Credit Card.
AMOITA IS NOT AFFILIATED WITH THE TOLLS COMPANY AND TOTALLY DISAGREES ON THE SYSTEM