Before making any turn, it is crucial to:

• Use the mirrors to look behind and to both sides for other road users to see if it is safe to turn.
• Check for less visible vehicles, such as motorcycles, bicycles, and mopeds.
• Always stay in the same lane until the turn is finished.
• All of the above.
  Explanation:

  "Before making any turn, it is crucial to: 1.Use the mirrors to look behind and to both sides for other road users to see if it is safe to turn. 2. Check for less visible vehicles, such as motorcycles, bicycles, and mopeds. 3. Always stay in the same lane until the turn is finished."