城市安全系统通过装在风挡玻璃后的激光传感器监视前方路段，计算出相关车速和距离并在事故无法避免时紧急刹车（城市安全系统在行驶速度很低时是关闭的，这样方便驾驶员可以把车近距离停放在其它车辆旁边）。
It applies the brakes if a collision cannot be avoided. (The system switches off at very low speeds, so that drivers can park close to other vehicles.)
基于对相应结构和建设要素的探讨，提出了城市公共安全系统优化和完善途径；
The optimization approach of the city public safety system is put forward base on the investigation of corresponding structure and factors.
本文研究内容来源于重庆市科委的一个攻关项目——城市交通紧急事件处理与安全系统。
This dissertation is based on one project of Science and Technology Committee in Chongqing named Emergency Management and Safety System of Urban Traffic.
为确保城市交通隧道的运营安全，需要建立城市交通隧道安全系统评价体系，对城市交通隧道的运营安全性能进行综合评价，提高城市交通隧道的运营安全品质。
An urban traffic tunnel safety evaluation system must be set up in order to make a synthetical evaluation of the running safety and improve the running safety quality of the traffic tunnel.
笔者采用组合功能分析和过程分解的方法，对城市公共安全系统的功能、结构和组成进行了讨论；
The function, structure and its component were discussed by combined function analysis and process decomposition approach.
笔者采用组合功能分析和过程分解的方法，对城市公共安全系统的功能、结构和组成进行了讨论；
The function, structure and its component were discussed by combined function analysis and process decomposition approach.
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