What must be used to mark any load projecting from the rear of the vehicle by 1.5m or more?

The requirement to mark any load projecting from the rear of a vehicle by 1.5 meters or more with a red flag or marker during the day and a red light at night is rooted in safety regulations that aim to increase visibility and awareness of oversized loads. During daylight hours, a red flag effectively signals to other drivers that there is an extended load, indicating potential hazards and the need for caution when passing.

At night, using a red light serves the same purpose by ensuring that the load remains visible when natural light is absent. The use of red in both cases is significant because it is a universally recognized color for caution, which helps drivers react appropriately to the potential danger posed by the projection of the load. By adhering to this regulation, drivers help maintain safety on the road and provide clear indications of their vehicle's profile to other motorists.