When placing a placard:

Question

Among other requirements, hazardous materials placards must be placed at least three inches away from any other markings; away from ladders or other attachments or devices; on backgrounds of contrasting color; and upright, with words or numbers level and reading left to right.

Accepted Answer

It should be at least three inches away from any other markings.

Answer

It could be placed under a ladder if space is an issue.

Answer

It can be affixed to a background of similar color.

Answer

It can be upside down.