How must a load be marked in darkness or bad visibility when it extends laterally more than 40 cm beyond the side lights of the vehicle?

The selected combination is correct because, according to German traffic regulations, when a load extends laterally more than 40 cm beyond the side lights of a vehicle, it must be marked appropriately to ensure visibility and safety.

The requirement to use a white light to the front helps other road users see the load from a distance, reducing the risk of collisions. The red light to the back serves a similar purpose, signifying to following vehicles that there is an obstruction extending beyond the normal width of the vehicle, also aiding in preventing accidents.

Not using both lights could lead to dangerous situations, especially in poor visibility conditions. It's essential to adhere to these regulations to ensure the safety of all road users.