What must a vehicle display if its load extends more than four feet beyond the rear?

• A yellow flag at the end of the load at all times
• A red lamp at the rear between sunset and sunrise, and a red flag between sunrise and sunset
  Explanation:

  "Vehicles transporting loads extending more than four feet beyond the rear must have a red lamp mounted at the end of the load, visible from both sides and the rear for 500 feet, between sunset and sunrise. During daylight hours, a red flag must be mounted at the end of the load."
• A white lamp and flag at all times
• A green flag and a blinking lamp during the day