What Is a Barrier Gate?

Barrier gates, also known as automatic rising arm barriers, are one of the most simple yet effective varieties of automated barriers. A boom gate consists of a long arm that lowers automatically to block the path of oncoming vehicles. To raise the arm, drivers must present a pass, enter a code, pay a toll, or wait until the system recognizes that it is safe for them to proceed. Typically, an electric motor raises and lowers the arm, while a sensor or security access system controls the operation of the motor.http://www.hptchina.com/flap-barrier-gate/