999 is for serious incidents only.
For example:
⫸ You see someone who has been in a serious accident.
⫸ You witness a crime.
⫸ Perhaps someone has fallen into the sea or driven off a cliff, or it could be some other dangerous situation.
⫸ You find a child who is lost and alone.
⫸ You might see a fire.
⫸ Maybe you had a fall and have broken a leg or an arm.
⫸ Or someone has a serious health problem.