Why is it that car rentals don't have toll tags?
The worst thing about renting a car is that it forces you to wait in lines at toll booths, because the rental cars don't have a toll like like E-ZPass. That's a real pain in the neck.
Most toll tag accounts have real-time access to toll activity records, so it would be very easy for a rental company to track your toll activity and simply add it to the bill.