FasTrak - Diagram of FasTrak toll collections system. As the vehicle enters the toll lane, sensors (1) detect the vehicle. The two-antenna configuration (2) reads a transponder (3) mounted on the vehicle's windshield. As the vehicle passes through the exit light curtain (4), it is electronically classified by the treadle (5) based on the number of axles, and the ETC account is charged the proper amount. Feedback is provided to the driver on an electronic sign (6). If the vehicle does not have a transponder, the system classifies it as a violator and cameras (7) take photos of the vehicle and its license plate for processing. If the license plate is registered as belonging to a FasTrak user, the account is debited only the toll charge, and no penalty is charged.
{}