How do boom gates operate on a loading dock?

At a loading dock, workers use a manual dock safe boom gate to help guide and secure a vehicle while it is being loaded or unloaded. The boom gate is mounted on a post at the dock and can be raised or lowered by the worker to control access.

Telescopic Boom Gates with a double rail act as a fall arrest protection system as well as being able to self-retract into themselves. This will allow them to avoid interference from overhead items that may obstruct the boom from opening and closing.