They should allow a way to pay by plate number PROACTIVELY. Utter pain in the rear to use the 407 with a rental car. NO way to prevent a rental agency from gouging you. Other toll agencies worldwide allow you to pay by plate/register a car being on the roadway. For the amount of money the toll road folks waste on paper bills you would think they would move to electronic proactive payments... Better yet allow me to input my plate number and date and let me pay ANY outstanding tolls within 14 days and charge me a surcharge for doing that - still got to be cheaper than letting a rental agency charge their nasty fees.