What must a driver do before 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, the driver must yield the right-of-way to all vehicles that are approaching on the highway to ensure safety."
• Sound the horn and proceed with caution
• Give a hand signal, then take the right-of-way