What must be done if cargo extends more than four feet from the back-rear bumper of a vehicle?

• No special markings are required.
• Display a 12-inch red or fluorescent orange square flag during the day and two red lights at night.
  Explanation:

  "Cargo that extends more than four feet from the vehicle's back-rear bumper must display a 12-inch red or fluorescent orange square flag. At night, this cargo must be marked with two red lights."
• Display a white flag at all times.
• Mark the cargo with reflective tape.