In 1998 , the ratio was 1 . 65 , which eventually dropped to 0 . 9 by the end of 2004 , comparing favourably with those of developed countries such as uk and singapore , and represents a major breakthrough for cpb in that for the first time in many years the number of false alarms has dropped below the number of alarm installations 在一九九八年，有关比率为一点六五，但至二四年底已降至零点九。就算与英国、新加坡等先进国家的同类数字比较，仍属骄人，也为防止罪案科带来重大突破，因为警钟误鸣的数字已降至少于警钟系统的数目。
The safety installation of the automobile bumpproof is a very hot topic nowadays , and it is also one of the most important part of intellectual traffic . we use the compound radar and fm coding technology , choose the unique route to produce and develop the expressway automobile bumpproof and alarming installation , which solve the " false alarming " problem that occurs while b eing interrupted in the complicated traffic conditions 汽车防撞安全装置是当今世界的热门话题，是智能交通的重要组成部分，我公司开发生产的高速公路汽车防撞报警装置采用复合雷达和调频编码技术，选择独特的技术路线，解决了复杂交通环境下因干扰而产生的"虚警"而且作用距离远，反应速度快，可靠性高。
An alarm installation will be downgraded to this level if it has 10 false calls in 365 days ; or the key holder , without reasonable excuse , fails to return to reset the alarm system within two hours , twice in 365 days . alarm systems downgraded to the fourth level will not receive a police response for 90 days 此外，如持匙人在三百六十五天内两次未能在鸣响后两小时内回到处所重新设置警钟，但又无合理解释，则其系统亦会降至第四级。警方不会处理任何属于第四级的警钟系统，为期九十天。
