Since Italian motorways form a network, the toll price is proportional to the distance traveled. To let the system calculate how much the toll is, the motorist has to withdraw a ticket from an automatic dealer before entering the motorway, returning it at the toll gate on exit. If a user loses the entry ticket prior to exiting the motorway, the toll assessed will be calculated from the most distant motorway access road accessible via the same route unless the user can prove by documentary evidence (hotel invoices, petrol receipts etc.) to have entered the motorway at another access. If the vehicle is equipped with a Telepass OBU (an automatic toll collection device) the ticket should not be picked up.