本发明涉及道闸闸杆，具体的说是涉及一种具有伸缩结构的道闸闸杆。
The invention relates to a road gate handler, in specific to a road gate handler with an expansion structure.
测验办法是，地感红灯闪耀时，用铁板放在线圈上，红灯长亮时取走铁板，闸杆主动落下则正常。
The test solution is to sense light shine, put the coil with the plate, a long red light when taking iron, brake rod fall automatically is normal.
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