Folding boom barriers, also known as folding gates or folding arm barriers, are a type of access control device commonly used in parking lots, driveways, and other entry points. Unlike traditional boom barriers that have a single horizontal arm, folding boom barriers feature multiple sections that fold accordion-style when raised, allowing for a more compact design when not in use.

These barriers typically consist of a series of interconnected vertical bars or panels that pivot horizontally as they extend or retract. When activated, the panels unfold to form a continuous barrier across the entry point, preventing unauthorized access. When not in use, the panels can be folded back to create a smaller footprint, making them suitable for areas with limited space.

Folding boom barriers are often operated electronically, with options for remote control or integration with access control systems such as keypads, card readers, or vehicle sensors. They offer effective traffic management and security control while providing flexibility in installation and space utilization.