ez Functionality

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Within the IAG, each member agency has its own billing and customer service center; all customer service centers are connected by a secure network (the "reciprocity network"). The agencies also set their own customer account policies. Areas of variation include the refundable deposit or nonrefundable charge for a tag, periodic maintenance fees, paper statement fees, the low account threshold, and replenishment amounts. E-ZPass is usually offered as a debit account: tolls are deducted from prepayments made by the users. Users may opt to have prepayments automatically deposited when their account is low, or they may submit prepayments manually. For commercial accounts, some agencies allow postpaid plans with a security deposit (which effectively renders them much like prepaid accounts with a different replenishment policy).

Several agencies offer discounted tolls to E-ZPass customers. The details vary widely, and can include general discounts for all E-ZPass users, variable pricing discounts for off-peak hours, commuter plans with minimum usage levels, flat rate plans offering unlimited use for a period of time, carpool plans for high-occupancy vehicles, and resident plans for those living near particular toll facilities. Many of these plans are only available to customers whose tags are issued by the agency that owns the toll facility in question. (Reciprocity only applies to tag acceptance, not to discounts.) Three authorities in New England (Maine, the Massachusetts Turnpike, and New Hampshire) restrict even their general discounts to their own respective tagholders.

E-ZPass tags are battery powered[1] RFID transponders, made exclusively by Mark IV Industries Corp - IVHS Division. They communicate with reader equipment built into lane-based or open road toll collection lanes. The most common type of tag is mounted on the inside of the vehicle's windshield behind the rear-view mirror. Some vehicles have windshields that block RFID signals. For those vehicles, an externally-mountable tag is offered, typically designed to attach to the vehicle's front license plate mounting points.

Most E-ZPass lanes are converted manual toll lanes and must have fairly low speed limits for safety reasons (5 and 15 mph are typical). In some areas, however (typically recently built or retrofitted facilities), there is no need to slow down, as E-ZPass users utilize dedicated traffic lanes ("Express E-ZPass") outside the toll booth (examples include Delaware Route 1, Virginia's Pocahontas Parkway, the express lanes of the Atlantic City Expressway and Garden State Parkway, and the Pennsylvania Turnpike's Warrendale and Mid-County (I-476) Toll Plazas). In October 2006 Illinois completed[2] its open road tolling for IPass/E-ZPass users making it the first state in the nation to feature Open Road Tolling at every toll plaza on the Illinois system. Pennsylvania is planning on using open-road tolling when they convert Interstate 80 into a toll road.