SSMs are deterrents; they are additional treatments that can be applied to grade crossings that will reduce the number of grade crossing violations.
附加安全措施是必要的关卡；附加安全措施是应用于平交道口的额外处理，以减少平交道口的违章事故数量。
Ahead of us there is a railroad crossing a highway at grade.
前面有一条铁路与公路平面交叉。
At present railway conditions, in order to reduce the accidents that occurred at the grade crossing, this paper put forward the scheme of design and setting of the locomotive auto-whistle device.
针对目前铁路的线路状况，为有效防止和减少道口事故的发生，提出了机车自动鸣笛装置的设计安装方案。
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