E-ZPass is an electronic toll collection system use on most tolled roads, bridges, and tunnels in the northeastern United States. 24 agencies spread across 13 states 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 Fast Lane in Massachusetts, Smart Tag in Virginia, I-Pass in Illinois, i-Zoom in Indiana, and the defunct M-Tag in Maryland.