Earlier this year, the Illinois Tollway Authority moved to issue I-PASS stickers and phase out transponders as part of an effort to create a more "convenient, reliable and less expensive travel experience" for customers. According to the tollway, the switch to stickers is being adopted by "toll agencies across the country," and will be ready for immediate use one registered.
Can you use I-PASS stickers across states as they ditch transponders? See story here.