High-tech devices make holiday travel more comfortable
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4. Unmanned boat
![](http://img2.chinadaily.com.cn/images/202402/05/65c0a50da3104efc33026829.jpeg)
Unmanned boats have been used for bridge inspection along the Chengdu-Chongqing intercity railway. Workers can measure the cross-section of riverbed in upstream and downstream areas with a remote control, and collect accurate and comprehensive data, thus offering a scientific basis for bridge maintenance.
![](http://img2.chinadaily.com.cn/images/202402/05/65c0a50da3104efc3302682c.jpeg)