When entering a freeway, what is the right time to turn on your turn signal?

• There is no compulsion for motorcyclists to turn on the signal when entering a freeway.
• When one reaches the entrance ramp and the freeway traffic is able to see you.
  Explanation:

  "When one reaches the entrance ramp and the freeway traffic is able to see you."
• When one reaches the exit ramp, from where one is visible to the other traffic on the freeway.
• The moment one reaches the acceleration lane and becomes visible to the other traffic on the freeway.