Some are accident-avoidance devices that use wi-fi signals to let drivers know where other cars are and to see around corners to give drivers a warning about an impending collision.

其中包括一些能够自动避免事故的设备，这些设备通过使用wi-fi无线网络信号，让驾驶员知道附近其他车辆的位置，还可以侦测到转弯处有无来车，以提醒驾驶员进行避让，避免车祸。

youdao

It realizes the dynamic monitoring, condition information memory, re-play and warning etc. to the spot signal devices by use of the advanced spot bus, sensors, web techniques, data base.

它采用先进的现场总线、传感器、计算机网络技术，利用数据库等软件工程，对现场信号设备实施动态监测，状态信息储存、重放和报警等。

youdao

However, the increasing numbers of mobile phones in use make it more likely that in crowded conditions such devices will give false alarms by warning you of the ringing of someone else's phone.

CNN: Technology - Alcatel personalizes vibrating phone alerts