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Some traffic agencies allow drivers to pass through the system at 55 miles per hour (86 kph). The rules regarding how fast you can pass through the toll plaza vary from system to system. A yellow light or some other signal will flash to indicate if an account is low or depleted. Typically, consumers maintain prepaid accounts. The electronic system records each toll transaction, including the time, date, plaza and toll charge of each vehicle. The entire process takes a matter of seconds to complete. Some lanes have text messages that inform drivers of the toll just paid and their account balance.

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A green light indicates that the driver can proceed.

If the toll lane has a gate, the gate opens.

If the account is in good standing, a toll is deducted from the driver's prepaid account.

That information is transferred from the lane antenna to the central database.

The transponder broadcasts a signal back to the lane antenna with some basic information.

As a car approaches a toll plaza, the radio-frequency (RF) field emitted from the antenna activates the transponder.

In the next section, you will see how all of these components work together to detect vehicles and collect tolls. These two devices are safeguards to ensure that all vehicles are counted correctly. A three-axle vehicle is charged a higher toll than a two-axle vehicle. Treadles are sensor strips embedded in the road that detect the number of axles a vehicle has. When that beam of light is broken, the system knows a car has entered. A light curtain is just a beam of light that is directed across the lane. Some electronic toll-collection systems may also include a light curtain and treadles. These two devices, the transponder and the antenna, interact to complete the toll transaction. The detection zone of an antenna is typically 6 to 10 feet (2 to 3 m) wide and about 10 feet long. These antennas emit radio frequencies that communicate with the transponder.

Stored in this RFID transponder is some basic account information, such as an identification number.ДЄntennas, or electronic readers, are positioned above each toll lane. The transponder is a two-way radio with a microprocessor, operating in the 900-MHz band. A transponder is a battery-operated, radio frequency identification (RFID) unit that transmits radio signals. This device is placed on the inside of the car's windshield behind the rearview mirror. Host computer system - All of the toll plaza LANs are connected to a central database via a Wide area network ( WAN).Дrivers usually have to pay a deposit to obtain a transponder, which is about the size of a deck of cards.

It is networked on a Local area network ( LAN).

Lane controller - This is the computer that controls the lane equipment and tracks vehicles passing through.

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