Which traffic sign refers to the actual mass?

You chose answer 1, which is correct. Traffic sign 1, showing a weight such as "5,5 t," refers to the actual mass (zulässige Gesamtmasse) of the vehicle or combination. This means only vehicles with a real total weight up to this limit may pass. Traffic sign 2, on the other hand, is a restriction for certain vehicle types, usually trucks, but does not specify a weight limit. In similar questions, look for the sign with a number and “t” for tonnage to identify mass-related restrictions.