What measures must you take if you break down with a load which has to be transported hot (e.g. bitumen transport)?

Your answer is fully correct. When a vehicle carrying a hot load, like bitumen, breaks down, German traffic rules require you to first ensure that your vehicle does not pose a danger or obstacle to other road users. This includes properly signaling, using hazard lights, and positioning warning triangles if needed. Secondly, you must organize help promptly to address the breakdown safely and efficiently, such as calling roadside assistance. Lastly, since the load must be kept at a certain temperature to maintain its properties and avoid hazards, you are responsible for managing the load’s temperature during the breakdown, for example by using heating systems or insulation. These combined measures protect both road safety and the special requirements of transporting hot materials.