"Pay by plate" means that your transponder was not read and your toll was charged to your account based on a reading of your vehicle's license plate. If you are receiving "pay by plates" often, check to see if your transponder is properly mounted. If your transponder is properly mounted and you continue to receive "pay by plate" charges, then you may need a replacement transponder. You can request a replacement transponder online. Once logged in to your account, use the "Transponder" tab to submit your request. Accounts with excessive "pay by plate" transactions may be assessed a $2 fee per transaction.