noun
crossing bar; boom barrier; toll bar
A horizontal bar that lowers to block passage, commonly seen at railway crossings, toll booths, and parking entrances.
踏切の遮断棒が下りると、車は止まらなければならない。
When the crossing bar at the railway crossing comes down, cars must stop.
駐車場の入口で遮断棒が上がるのを待った。
I waited for the boom barrier at the parking lot entrance to rise.
A more general term for a gate or barrier, often used in parking lots and toll roads, but 遮断棒 emphasizes the physical bar.
Compound of 遮断 (しゃだん, 'interruption, blocking') and 棒 (ぼう, 'bar, rod'). The term transparently describes a bar that blocks passage.