You should drive more carefully when approaching a slow-moving vehicle from the rear because:

• They are difficult to see.
• They may suddenly speed up.
• They may make wide turns and turn right or left at any time into unmarked entrances.
  Explanation:

  "Slow-moving vehicles may make wide turns and turn right or left at any time into unmarked entrances. When approaching a slow-moving vehicle from the rear, stay a safe distance behind it and only pass when it is safe to do so."
• All of the above.