What marking is required during the day to mark the extremities of a load that extends beyond a vehicle's sides and more than four feet beyond its rear?

• Blue flags at least 18 inches square
• Yellow flags at least 12 inches square
• Red flags at least 18 inches square
  Explanation:

  "During the day, any commercial motor vehicle transporting a load that extends beyond the sides by more than 4 inches or more than 4 feet beyond the rear must have the extremities of the load marked with red warning flags. Each flag must be at least 18 inches square."
• Green flags at least 15 inches square