When preparing to turn onto a busy road, what should you keep in mind?

• The faster the traffic is moving, the sooner you should plan your turn.
  Explanation:

  "The faster the traffic is moving, the sooner you should plan your turn."
• The faster the traffic is moving, the later you should plan your turn.
• You should always wait for traffic to slow down before planning your turn.
• You should never turn onto a busy road.