（二）在铁路、城市轨道交通线路上放置障碍物，或者故意向列车投掷物品的；
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因为这个激光雷达的点云可信度不够，（系统）不敢采纳，防止有时候误检测来个幽灵刹车。
Flexible travel is therefore no longer optional. It now fundamentally influences demand, operational workflows, and system design, requiring airlines and travel providers to adapt both processes and technology to meet baseline expectations.