What must you do when entering a highway from a private road or driveway?

• Enter or cross the highway as quickly as possible.
• Yield right-of-way to all vehicles approaching on the highway.
  Explanation:

  "When entering a highway from a private road or driveway, you should yield right-of-way to all vehicles approaching on the highway."
• Sound horn and proceed with caution.
• Give hand signal then take right-of-way.