"Be careful when you cross the road."

Translation: 小心过马路！

[wgss.ca]

this is wrong! It literally means be careful of the word "crossing road"

[KX3.]

It's sort of a Chinese set phrase.

[Dad607566]

The correct way to sat this ought to be ”过马路要小心”

Most people i have heard say this tend to add ”一点” as well but that would translate as "Be a bit careful when crossing the road."

[Imnuts7]

'Cross the road carefully' is more literal.