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An automatic barrier gate is traffic control equipment that is primarily used for violation enforcement by blocking traffic from exiting the lane until the toll due is paid. In manual and automatic lanes equipped for ETC, gates are also used to reduce the speed of ETC traffic for the safety of attendants who must walk across plaza lanes. The gate is comprised of a cabinet containing a gate motor, controller interface, gate arm support assembly and gate arm. Upon a fare being paid, the lane subsystem transmits a signal to the gate controller that energizes the motor to automatically raise the gate arm from a horizontal position to a vertical position, thereby releasing the paid vehicle. The gate arm is returned to a horizontal positions after the exiting vehicle is no longer detected by one or more detection devices installed adjacent to the barrier gate and connected to either the gate controller or lane controller.
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