4 sentences

1. 车速已经开到一百码了。

   chē​sù yǐ​jīng kāi dào yī​bǎi mǎ le.

   The car was already going at 100 kilometers per hour.

   Source: Dong Chinese Dictionary

2. 高速公路上有严格的车速限制。

   gāo​sù gōng​lù shàng yǒu yán​gé de chē​sù xiàn​zhì.

   There are strict speed limits on the highway.

   Source: Dong Chinese Dictionary

3. 看到前方有行人，司机放慢了车速。

   kàn​dào qián​fāng yǒu xíng​rén, sī​jī fàng​màn le chē​sù.

   Seeing pedestrians ahead, the driver slowed down.

   Source: Dong Chinese Dictionary

4. 由于车速太快，他躲避不及撞上了护栏。

   yóu​yú chē​sù tài kuài, tā duǒ​bì bù​jí zhuàng​shàng le hù​lán.

   Because he was driving too fast, he couldn't swerve in time and hit the guardrail.

   Source: Dong Chinese Dictionary