How must a load projecting more than 1 m beyond the rear reflectors of the vehicle be marked in darkness?

Your answer is correct. When a load projects more than 1 meter beyond the rear reflectors of a vehicle and it is dark outside, the end of the load must be clearly marked with both a red light and a red rear reflector. This makes the projecting load visible to other road users in low light conditions, reducing the risk of accidents. Other markings, like an orange warning plate or just switching on the fog tail lamp, do not meet the legal requirements in Germany for this situation. Knowing this helps ensure traffic safety and avoids fines.