If you're driving and a vehicle that was behind you disappears from view when you're about to switch lanes, what is the appropriate action to take?

• Swiftly move into the other lane to dodge the vehicle that's out of sight.
• Glance at your side mirror to check if the vehicle has moved into your blind spot.
• Turn on your signal and gradually change lanes, without looking again.
• Quickly look over your shoulder to confirm the vehicle isn't in your blind spot.
  Explanation:

  "Mirrors may not always provide a complete view, and vehicles can easily hide in blind spots. To ensure safe lane changes, it's important to physically check your blind spot by looking over your shoulder before changing lanes."