What should you do if the inside rearview mirror is blocked?

• Continue driving and rely on the other rearview mirrors.
• Make sure nothing blocks your inside rearview mirror.
• Attach an outside rearview mirror on each side of the vehicle.
  Explanation:

  "If the view from your inside rearview mirror is blocked, you must attach an outside rearview mirror on each side of the vehicle to maintain full visibility of traffic behind you,"
• You are not allowed to drive if this happens.