2 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. 行人应当走天桥过马路，不要横穿马路。

   xíng​rén yīng​dāng zǒu tiān​qiáo guò mǎ​lù, bù yào héng​chuān mǎ​lù.

   Pedestrians should use the footbridge to cross the street instead of jaywalking.

   Source: Dong Chinese Dictionary