There are 2 different toll system, one is fully automatic without any option to pay locally and another with gates or barriers where you are able to stop take a ticket and pay at the end, where you want to exit.
Our system only work for automatic toll road, used in the A22 / A23 / A28 / A25 / A29, where is not possible to pay locally.
All our cars are provided with a toll device in the windscreen with 15€ credit to use in your rental, we charge 5€ for administrative fee, reason why you pay 20€
In case you exceed the 15€ credit, we will charge on the credit card, supplied for security propose, multiples of 5€
Total amount used: 18,25 = 20€ (round to the next 5€ multiple) - 15€ (credit you start) = 5€ extra charge