For purposes of interoperability, all agencies are connected to each other by a secure network (the "reciprocity network"). This network provides the means to exchange tag data and process toll transactions across the various agencies. Tag data is exchanged among the agencies on a nightly basis. This data can take up to 24 hours on the primary network the unit is issued by (e.g., the New York State Thruway or Illinois Tollway system), but may be delayed by as much as 72 hours on other networks.