When should you signal your intention to turn?

• Just before making the turn
• At least 50 feet before making the turn
  Explanation:

  "It is illegal to turn without signaling. You should signal for at least 50 feet before you turn, slow down, or stop. You can use the turn indicators on your car or you can use arm signals. When you use arm signals, bring your arm in during the actual turn to keep control of the steering wheel."
• At least 100 feet before making the turn
• Only when there is heavy traffic