Safety signs.

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Across
  1. 2. a picture or symbol that represents a word, phrase, or idea:
  2. 4. something that makes us aware of possible danger
  3. 6. shaped like a circle
  4. 7. able to be seen
  5. 8. having the duty of taking care of something
  6. 10. Something that must be done, or is demanded by law
Down
  1. 1. officially not allowing something,
  2. 3. anything that has three straight sides:
  3. 5. something dangerous and likely to cause damage
  4. 9. any square-shaped object