I only travel the Illinois Tollway once a year. I drive thru them then when I get home I go to the site below and pay the tolls. There are signs along the tollway instructing you to do this if you miss the toll both.
www.illinoistollway.com
Tolls and I-PASS
Unpaid Tolls
Tolls and I-PASS
About I-PASS
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Toll Information
Unpaid Tolls
Unpaid Toll Opening Page
Violations
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Unpaid Toll?
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We understand that mistakes happen. At times, customers who pay cash may find themselves in an unattended toll plaza lane or in an I-PASS Only lane. If this happens, continue driving forward. Do not back up at any time--it is unsafe. Make note of your location by identifying the toll plaza name or number or the nearest milepost. You will be required to identify the unpaid toll location when submitting your payment. Be sure to go online or pay by mail within the 7-day grace period.
Payments can be made online or by mail, though online payment is recommended because it provides a record of transmission within the 7-day grace period.
If you experience problems in processing an online payment, you also have the option of mailing your payment for the unpaid toll