What is the maximum permissible total mass of an articulated motor vehicle (three-axle truck tractor, three-axle semitrailer) in combined traffic with 40 feet ISO containers?

You answered correctly. In Germany, when an articulated vehicle (such as a three-axle truck tractor with a three-axle semitrailer) is used in combined transport to carry a 40-foot ISO container, the maximum permissible total mass is 44 tons. This exception to the general weight limit is allowed specifically for combined transport to encourage intermodal freight traffic. For regular road haulage (not combined transport), the limit is usually 40 tons, but the law allows the 44-ton limit to make combined road-rail or road-waterway transport more efficient. Knowing this exception helps when answering questions about maximum permissible weights for special transport operations.