Wikipedia
E‑ZPass is an electronic toll-collection system used on most tolled roads, bridges, and tunnels in the midwestern and northeastern United States, south to North Carolina, and west to Illinois. Currently, there are 37 agencies spread across 16 states that make up the E‑ZPass Interagency Group (IAG). All member agencies use the same technology, allowing travelers to use the same E‑ZPass transponder throughout the IAG network. Various independent systems that use the same technology have been integrated into the E‑ZPass system. These include I‑Pass in Illinois and NC Quick Pass in North Carolina. Other interoperable systems retained their own branding for some time, but many have since been rebranded simply as E-ZPass.
The Indiana Toll Road uses the E-ZPass system for electronic toll collection which is also usable on the ITR's adjacent sister road, the Chicago Skyway. On June 27, 2007, the system was implemented from mile 1 to mile 23 of the road under the unique branding of i-Zoom, which was fully compatible with E-ZPass and the Illinois State Toll Highway Authority's I-Pass system; the remaining toll plazas came online on April 1, 2008, with increased cash toll rates. i-Zoom transponders were then made available for purchase at service plazas and CVS/pharmacy locations in northern Indiana. As of September 2012, the i-Zoom branding was retired by the ITR for the universal E-ZPass branding used by most states in the E-ZPass system; outside of the implementation of a transponder with a smaller form factor and the removal of the i-Zoom logo from post-September 2012 transponder units, along with a website upgrade in 2014, no other changes to transponders or accounts are planned.