The gross vehicle weight rating of your towing vehicle amounts to 6.5 t; the gross vehicle weight rating of your trailer is 5.5 t. Is this combination vehicle liable to the toll if used on a motorway?

In this scenario, the correct answer indicates that the combination vehicle is indeed liable for tolls when used on the motorway under specific conditions. According to German traffic regulations, a combination vehicle, which consists of a towing vehicle and a trailer, must be considered based on their respective gross vehicle weights.

The first part of the correct answer states that the combination is liable to tolls if it's intended exclusively for the carriage of goods. This reflects the rules that apply primarily to commercial vehicles.

The second part of the answer clarifies that regardless of the weight of the towing vehicle alone, if the total gross combination weight exceeds 7.5 tons, as outlined in German toll law, the vehicle is automatically subject to tolls.

Understanding these regulations is important because they help differentiate between passenger vehicles and commercial vehicles and define the financial responsibilities of operators using Germany's motorway system. Hence, in cases where the total weight exceeds 7.5 tons, tolls are applicable irrespective of the individual weights of the components of the vehicle configuration.