系统试运行表明，该系统能自动检测隧道内的故障停车并发出报警信号。
Experiments and trial operation show that the system can automatically detect the trouble parking in tunnel and give an alarm.
当物流运输装置在前进时遇到障碍时，则采用图像和光电传感器双重识别，使运输装置自动停止，并发出报警信号。
When the device meet the obstacle while moving forward, it can stop and alarm automatically through the image and optical electrical sensors which perform dual identify.
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