4 sentences

1. 为了安全起见，请不要随意横穿马路。

   wèi​le ān​quán qǐ​jiàn, qǐng bù yào suí​yì héng​chuān mǎ​lù.

   For safety's sake, please do not cross the road wherever you like.

   Source: Dong Chinese Dictionary

2. 为了安全起见，请在大巴上系好安全带。

   wèi​le ān​quán qǐ​jiàn, qǐng zài dà​bā shàng jì hǎo ān​quán​dài.

   To be on the safe side, please fasten your seatbelt on the bus.

   Source: Dong Chinese Dictionary

3. 为了保险起见，他请专家鉴定这张古钞的真假。

   wèi​le bǎo​xiǎn qǐ​jiàn, tā qǐng zhuān​jiā jiàn​dìng zhè zhāng gǔ​chāo de zhēn​jiǎ.

   To be safe, he asked an expert to authenticate this ancient banknote.

   Source: Dong Chinese Dictionary

4. 为了安全起见，警方封锁了这栋建筑的所有出口。

   wèi​le ān​quán qǐ​jiàn, jǐng​fāng fēng​suǒ le zhè dòng jiàn​zhù de suǒ​yǒu chū​kǒu.

   For safety reasons, the police cordoned off all exits of the building.

   Source: Dong Chinese Dictionary