3 sentences

1. 我们不能被警察拦下。

   wǒ​men bù néng bèi jǐng​chá lán​xià.

   We cannot get pulled over by the cops.

   Source: OpenSubtitles

2. 我们在半路上被拦下了。

   wǒ​men zài bàn​lù shàng bèi lán​xià le.

   On the way, we were stopped.

   Source: OpenSubtitles

3. 他在高速公路上超速行驶，结果被交警拦下了。

   tā zài gāo​sù gōng​lù shàng chāo​sù xíng​shǐ, jié​guǒ bèi jiāo​jǐng lán​xià le.

   He was speeding on the highway and was stopped by the traffic police.

   Source: Dong Chinese Dictionary