What happens when the hand signal appears while pedestrians are already crossing?

• They should immediately come back to their original positions.
• They should start running and pushing each other.
• They should go as quickly as possible to a safe area.
  Explanation:

  "If you are already crossing when the hand signal appears, it is important to move quickly to a safe area. Avoid returning to your original position or pushing others."
• All of the above.