What is the correct response if, when reversing a combination vehicle the view to the rear is impeded?

Your selected response is correct because, according to German traffic regulations, if the view to the rear is blocked when reversing a combination vehicle, it is essential to stop the vehicle if the line-of-sight to the person directing is broken. This rule ensures safety, as the person directing helps guide the driver and prevent accidents. In situations with limited visibility, relying solely on mirrors may not be sufficient. Therefore, the presence of a person directing is not only critical when entering a priority road but is applicable in various scenarios to maintain safety and effective communication while reversing.