Why should you leave extra room before you return to your lane in front of a heavy commercial vehicle?

• It is heavier and that means it might topple over.
• It requires more distance to slow or stop.
  Explanation:

  "Heavy commercial vehicles will require more distance to slow or stop. After passing one, leave extra room before you return to your lane in front of it."
• It requires less distance to slow or stop.
• None of the above.