On this road traffic sign, to what does the information “12 t” refer?

This traffic sign indicates a weight limit for vehicles, specifically limiting the actual mass of the vehicle to a maximum of 12 tonnes. The key point is that it refers to the total actual mass of the vehicle itself, not the maximum authorized mass on the registration or the mass of the load alone. In German traffic rules, this helps prevent damage to roads or bridges by restricting heavier vehicles from passing. So, if your vehicle weighs more than 12 tonnes, you are not allowed to drive past this sign. Understanding this distinction is important for complying with weight restrictions and avoiding fines or accidents.