Boom Gate
A boom gate is a bar, or pole pivoted in such a way as to allow the boom to block vehicular access through a controlled point. It is generally electric motor driven and commonly has a system of vehicle detection for closing and authorised entry detection such as a card reader for opening.
Maintenance
The VicRoads Road Structures Inspection Manual suggests that emergency boom gates should be the subject of a routine maintenance inspection at least twice a year.