E-ZPass

E-ZPass Interagency Group (E-ZPass Group trade name and E-ZPass product brand) is an electronic toll collection system used on toll roads, toll bridges, and toll tunnels in the eastern half of the United States. The group itself is composed of several states' member agencies, which share the same technology and allow travelers to use the same transponder on toll facilities throughout the network. It was created in 1987, since which time several states' compatible systems have rebranded to E-ZPass. Negotiations for nationwide interoperability are ongoing.

==Functionality== ===Technology=== right|thumb|An E-ZPass toll booth in New York City with its transmission antennae highlighted in the yellow boxes right|thumb|An E-ZPass system transponder unit, also known as a tag or a pack, was distributed by the Massachusetts Turnpike Authority for use with their E-ZPass-compatible Fast Lane system and other roads which utilize E-ZPass. thumb|New G4 style E-ZPass transponder for MassDOT manufactured by [[Kapsch]] thumb|The Illinois State Toll Highway Authority replaced traditional transponder units for [[I-Pass with sticker transponders in 2024, which require no power and are permanent to the vehicle whose windshield it is affixed to (previous transponders will remain issued and can be used until their expiration in the 2030s, and larger vehicles will still use traditional transponders for the time being to allow swapping).]] thumb|An E-ZPass exterior license plate mount transponder E-ZPass tags are active RFID transponders, historically made by Kapsch TrafficCom (formerly Mark IV Industries Corp—IVHS Division) under a competitively bid contract. They communicate with reader equipment built into lane-based or open-road toll collection lanes by transmitting a unique radio signature. The most common type of tag is an internal tag that can be mounted on the inside of the vehicle's windshield in proximity to the rear-view mirror. Though toll agencies advise adherence to the windshield with mounting strips (usually 3M's Scotch brand "Dual Lock" fasteners), third-party options using trays with suction cups to adhere a pass to a windshield temporarily if used in multiple vehicles are available. Some vehicles have windshields that block RF signals; for those vehicles, historical vehicles, and customers who have aesthetic concerns, an external tag is offered, typically designed to attach to the vehicle's front license plate mounting points.