VES is used to capture images of the license plates of vehicles that use ETC lanes without valid ETC tags. A notice is then sent to the owner indicating that a toll is due.
Most agencies also levy a processing fee which, relative to the toll, can be very high.
The main purpose of the fee is to deter motorists from habitually violating the toll and also to offset the cost of processing the violation. In the event that the owner does not pay the toll, agencies can forward the matter to the local judicial system for resolution. When an agency operates a toll facility, the agency requires the patron to pay the appropriate toll. In a non-ETC operation, either a toll collector is present to receive the payment before the patron exists the toll lane or a gate is employed. The presence of toll collectors and gates in lanes provide the greatest deterrents against toll violations.