For what three reasons do you have to use turn signals?

• To notify the other driver(s) of your intention
  Explanation:

  "To notify the other driver(s) of your intention"
• None of them
• To advise pedestrians of what you want to do
  Explanation:

  "To notify the other driver(s) of your intention"
• To send out an alert of your intentions
  Explanation:

  "To notify the other driver(s) of your intention"