SSMs are deterrents; they are additional treatments that can be applied to grade crossings that will reduce the number of gradecrossing 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。
2
At present railway conditions, in order to reduce the accidents that occurred at the gradecrossing, 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。
3
When nationalist thugs beat up a Jewish friend, she defaced her grade card, crossing out the stamp that allowed her to sit on the "Aryan" seats.