Where any load projects more than 150 millimetres to the side, or more than 300 millimetres to the rear, it must be marked by means of;

a red flag or flags (300mm x 300mm) during the day, and

retro reflectors at night, or

any other time when persons and vehicles are not clearly visible due to unfavourable conditions. White retro reflectors to the front and red retro reflectors to the rear.